Abstract: The disclosure discloses a spinning process of a magnesium alloy wheel hub, which comprises the following steps: step 1, heating a magnesium alloy bar at 350-430° C. and keeping the temperature for 20 minutes; step 2, initially forging and forming on the bar under a forging press, wherein the forging down-pressing speed is 6-15 mm/s; step 3, finally forging and forming on the bar under a forging press, wherein the forging down-pressing speed is 5-8 mm/s; step 4, stress relief annealing on the final forged magnesium alloy blank; step 5, solid dissolving on the annealed magnesium alloy blank; step 6, taking out the solid-dissolved blank and directly spinning by a spinning machine; step 7, heating treatment and aging treatment. The magnesium alloy wheel hub with excellent performance is obtained by the process, and the spinning process and processing efficiency are greatly improved.

Abstract: In one aspect of the invention, an alloy includes a first element comprising magnesium (Mg), titanium (Ti), zirconium (Zr), chromium (Cr), or nickelaluminum (NiAl), a second element comprising lithium (Li), calcium (Ca), manganese (Mn), aluminum (Al), or a combination thereof, and a third element comprising zinc (Zn). According to the invention, nanoscale precipitates is produced in the magnesium alloy by additions of zinc and specific heat-treatment. These precipitates lower the energy for dislocation movements and increase the number of available slip systems in the magnesium alloy at room temperature and hence improve ductility and formability of the magnesium alloy.

Abstract: A magnesium alloy includes Mg, 1 to 12 wt % of Li, 1 to 10 wt % of Al and 0.2 to 3 wt % of Zn. The magnesium alloy has a microstructure which includes a nanoscale reinforcement phase, wherein the nanoscale reinforcement phase is a Li—Al compound.

Abstract: Disclosed is a magnesium alloy material having excellent tensile strength and favorable ductility. Therefore, the magnesium alloy sheet material formed by rolling a magnesium alloy having a long period stacking order phase crystallized at the time of casting includes in a case where a sheet-thickness traverse section of an alloy structure is observed at a substantially right angle to the longitudinal direction by a scanning electron microscope, a structure mainly composed of the long period stacking order phase, in which, at least two or more ?Mg phases having thickness in the observed section of 0.5 ?m or less are laminated in a layered manner with the sheet-shape long period stacking order phase.

Abstract: A magnesium alloy includes <3% by weight of Zn, ?0.6% by weight of Ca, with the rest being formed by magnesium containing impurities, which favor electrochemical potential differences and/or promote the formation of intermetallic phases, in a total amount of no more than 0.005% by weight of Fe, Si, Mn, Co, Ni, Cu, Al, Zr and P, wherein the alloy contains elements selected from the group of rare earths with the atomic number 21, 39, 57 to 71 and 89 to 103 in a total amount of no more than 0.002% by weight.

Abstract: A tin-containing magnesium alloy having superior tensile strength and superior elongation. A method of manufacturing a magnesium alloy includes melting and casting raw materials including an element selected from the group consisting of more than 0 weight % and 14 weight % or less of Sn, more than 0 weight % and 5 weight % or less of Li, more than 0 weight % and 40 weight % or less of Pb, more than 0 weight % and 17 weight % or less of Al, and more than 0 weight % and 5 weight % or less of Zn and a remainder of Mg, subjecting the cast magnesium alloy to solution treatment, subjecting the solution-treated magnesium alloy to aging, and plastically deforming the aged magnesium alloy.

Abstract: To provide a magnesium alloy having high incombustibility, high strength and high ductility together. A magnesium alloy including Ca in an amount of “a” atomic %, Al in an amount of “b” atomic % and a residue of Mg, including (Mg, Al)2Ca in an amount of “c” volume %, wherein “a”, “b” and “c” satisfy the following equations (1) to (4), and having the (Mg, Al)2Ca dispersed therein. 3?a?7??(1) 4.5?b?12??(2) 1.2?b/a?3.

Abstract: A magnesium alloy having high ductility and high toughness, and a preparation method thereof are provided, in which the magnesium alloy includes 1.0-3.5 wt % of tin, 0.05-3.0 wt % of zinc, and the balance of magnesium and inevitable impurities, and a preparation method thereof. Magnesium alloy with a relatively small tin content is added with zinc, and optionally, with one or more alloy elements selected from aluminum, manganese and rare earth metal, at a predetermined content ratio. As a result, the alloy exhibits superior ductility and moderate strength due to the suppression of excessive formation of precipitates and some precipitates hardening effect, respectively. Accordingly, compared to extruded material prepared from conventional commercial magnesium alloys, higher ductility and toughness are provided, so that the alloy can be widely applied over the entire industries including automotive and aerospace industries.

Abstract: An alloy and an implant having a three-dimensional structure based on such alloy. The alloy comprises a MgZnCa alloy containing nanosized precipitates being less noble than the Mg matrix alloy and having a Zn content ranging 0.1 wt. % Zn to 2 wt. % Zn and a calcium content ranging from 0.2 wt. % to 0.5 wt. %, and having less than 0.04 wt. % of one or more other elements with the remainder being Mg. For these micro-alloys, any second phase generated during the solidification process can be completely dissolved by a solution heat treatment. Finely dispersed nanosized precipitates can then be generated by a subsequent aging heat treatment step. These precipitates are used to “pin” the grain boundaries and to prevent the coarsening of the grain structure during further processing to achieve grain sizes below 5 ?m.

Abstract: Provided by the present invention are a fine crystallite high-function metal alloy member, a method for manufacturing the same, and a business development method thereof, in which a crystallite of a metal alloy including a high-purity metal alloy whose crystal lattice is a face-centered cubic lattice, a body-centered cubic lattice, or a close-packed hexagonal lattice is made fine with the size in the level of nanometers (10?9 m to 10?6 m) and micrometers (10?6 m to 10?3 m), and the form thereof is adjusted, thereby remedying drawbacks thereof and enhancing various characteristics without losing superior characteristics owned by the alloy.

Abstract: Provided is a Mg alloy, in which precipitated particles are dispersed and which has enhanced tensile strength regardless of the size of the magnesium matrix grains therein.

Abstract: An Mg alloy provided with high strength and high ductility by matching the strength and ductility in tensile deformation and compressive deformation at the same levels is provided. The Mg alloy of the present invention is characterized by having a chemical composition consisting of Y: 0.1 to 1.5 at % and a balance of Mg and unavoidable impurities and having a microstructure with high Y regions with Y concentrations higher than an average Y concentration distributed at nanometer order sizes and intervals. The present invention further provides an Mg alloy characterized by having a chemical composition consisting of Y: more than 0.1 at % and a valance of Mg and unavoidable impurities, having a microstructure with high Y regions with Y concentrations higher than an average Y concentration distributed at nanometer order sizes and intervals and having an average recrystallized grain size within the range satisfying the following formula 1: ?0.87c+1.10<log d<1.14c+1.

Abstract: A method of enhancing the ductility of magnesium alloy sheets containing 85% or more by weight of magnesium is described. An annealed, substantially strain free, sheet of generally uniform grain size is locally deformed in local regions to develop strained ‘islands’ of a predetermined strain embedded in a substantially strain-free matrix and then annealed. The deformed regions undergo recrystallization and grain growth while the remainder of the sheet suffers only minor change in grain size, leading to sheet with grains having a bimodal size distribution. The ductility of alloys processed in this way is significantly greater than the ductility of the unprocessed, uniform grain size alloy without compromise to the tensile strength of the alloy.

Abstract: A magnesium alloy member capable of achieving a mechanical strength and a high-temperature fatigue strength sufficient for a compressor for in automotive air conditioners The magnesium alloy member is formed by subjecting a cast material of a magnesium alloy containing, on the basis of mass %, from 0.3% to 10% calcium (Ca), from 0.2% to 15% aluminum (Al), and from 0.05% to 1.5% manganese (Mn), and containing calcium (Ca) and aluminum (Al) at a calcium/aluminum mass ratio of from 0.6 to 1.7, with the balance being magnesium (Mg) and inevitable impurities to plastic working (extrusion processing) at from 250° C. to 500° C. This makes it possible to obtain a magnesium alloy member having a room-temperature 0.2% proof stress of 300 MPa or more and a 150° C. fatigue strength of 100 MPa or greater.

Abstract: Magnesium-based hydrogen storage alloys having metallic magnesium (Mg) and a magnesium-containing intermetallic compound (MgxMy wherein y is 1?x) and containing not less than 60 mass-% of magnesium in total, and having a phase of a primarily crystallized magnesium-containing intermetallic compound in its solidification structure.

Abstract: A magnesium alloy comprising up to about six weight percent zinc and up to about one weight percent cerium may be hot worked to produce an intermediate or final alloy workpiece that exhibits enhanced ductility and strength at room temperature. The addition of zinc and a small amount of cerium may affect the magnesium alloy by increasing strength and ductility, and improving the work hardening behavior.

Abstract: A magnesium alloy having excellent strength and elongation at high temperatures and further having excellent creep characteristics at high temperatures. Also provided is a process for producing the alloy. In producing the magnesium alloy, a magnesium alloy containing yttrium and samarium in respective specific amounts is cast and the resultant cast is subjected to a solution heat treatment, subsequently hot working, and then an aging treatment, thereby reducing the average crystal grain diameter of the structure. In addition, the amounts of the yttrium and samarium in solution in the magnesium matrix are balanced with the number of precipitate particles of a specific size in the crystal grains. The magnesium alloy thus obtained has excellent strength and elongation at high temperatures and further having excellent creep characteristics at high temperatures.

Abstract: Provided is a Mg alloy, in which precipitated particles are dispersed and which has enhanced tensile strength regardless of the size of the magnesium matrix grains therein.

Abstract: A magnesium alloy shown includes magnesium as a principal ingredient, and 0.5 to 8.0 percent ytterbium; 0.1 to 2.0 percent calcium; and 0.2 to 6.0 percent zinc, percentages calculated by weight. The magnesium alloy may be employed as an implant. Examples of implants include a plate, specifically a bone plate, a screw, a nail, a bone nail, a stent, a rod. Implants made of the specified alloy are suitable for implantation in animal or human body.

Abstract: A high-strength and high-toughness magnesium based alloy contains, by weight, 1 to 8% rare earth element and 1 to 6% calcium and the maximum crystal grain diameter of magnesium constituting a matrix is not more than 30 ?m. At least one intermetallic compound (6) of rare earth element and calcium has a maximum grain diameter of 20 ?m or less and it is dispersed in a crystal grain boundary (5) and a crystal grain (4) of magnesium of the matrix.

Abstract: A magnesium alloy having excellent strength and elongation at high temperatures and further having excellent creep characteristics at high temperatures. Also provided is a process for producing the alloy. In producing the magnesium alloy, a magnesium alloy containing yttrium and samarium in respective specific amounts is cast and the resultant cast is subjected to a solution heat treatment, subsequently hot working, and then an aging treatment, thereby reducing the average crystal grain diameter of the structure. In addition, the amounts of the yttrium and samarium in solution in the magnesium matrix are balanced with the number of precipitate particles of a specific size in the crystal grains. The magnesium alloy thus obtained has excellent strength and elongation at high temperatures and further having excellent creep characteristics at high temperatures.

Abstract: The present invention relates to creep-resistant magnesium-based alloys with low susceptibility to hot tearing, and with improved ductility, impact strength and fracture toughness, and corrosion resistance. The alloys contain at least 96 wt % magnesium, 1.5 to 1.9 wt % neodymium, 0.10 to 0.30 wt % yttrium, 0.35 to 0.70 wt % zirconium, 0.05 to 0.35 wt % zinc, 0.01 to 0.10 wt % calcium, 0.01 to 0.15 wt % strontium, and 0.0000 to 0.0005 wt % beryllium, and they are suitable for low pressure and gravity castings. Articles, that are castings of the alloys, are suitable for applications at temperatures as high as 175-250° C.

Abstract: A heat-resistant magnesium alloy according to the present invention includes Mg, a major component; a first alloying element “M1” being any one or more members that are selected from the group consisting of Al and Ni; a second alloying element “M2” being any one or more members that are selected from the group consisting of Mn, Ba, Cr and Fe; and Ca; and it has a metallic structure including: Mg crystalline grains; plate-shaped precipitated substances being precipitated within grains of the Mg crystalline grains; and grain-boundary crystallized substances being crystallized at grain boundaries between the Mg crystalline grains to form networks that are continuous microscopically. Since the plate-shaped precipitated substances exist within the Mg crystalline grains, the movements of dislocation within the Mg crystalline grains are prevented, and accordingly it becomes less likely to deform.

Abstract: A high strength magnesium alloy improving the high temperature strength while not using any expensive rare earth elements and thereby reducing the cost and its method of production are provided, that is, a high strength magnesium alloy of a composition of the formula Mg100?(a,b)ZnaXb wherein X is one or more elements selected from Zr, Ti, and Hf, a and b are the contents of Zn and X expressed by at %, and the following relationships (1), (2), and (3): (1) a/28?b?a/9, (2) 2<a<10, (3) 0.05<b<1.

Abstract: There are provided a magnesium alloy with a misch metal, a method of producing a wrought magnesium alloy with a misch metal, and a wrought magnesium alloy produced thereby, in which a great deal of misch metal is added to magnesium, and thus refractory eutectic phases or multi-phases are formed into a stable network structure or a stable dispersed phase, thereby inhibiting deformation of a magnesium matrix at a high temperature to maintain a high strength. The magnesium alloy with the misch metal has the formula of Mg100-x-y-gAxByCz, where A is zinc (Zn) or aluminum (Al); B is the misch metal; C is at least one element selected from the group consisting of manganese (Mn), nickel (Ni), copper (Cu), tin (Sn), yttrium (Y), phosphor (P), silver (Ag), and strontium (Sr); and x, y and z are the compositions of 0 at %?x?6 at %, 0.8 at %?y?7 at %, and 0 at %?z?2 at %, respectively.

Abstract: The present invention relates to creep-resistant magnesium-based alloys with low susceptibility to hot tearing, and with improved ductility, impact strength and fracture toughness, and corrosion resistance. The alloys contain at least 96 wt % magnesium, 1.5 to 1.9 wt % neodymium, 0.10 to 0.30 wt % yttrium, 0.35 to 0.70 wt % zirconium, 0.05 to 0.35 wt % zinc, 0.01 to 0.10 wt % calcium, 0.01 to 0.15 wt % strontium, and 0.0000 to 0.0005 wt % beryllium, and they are suitable for low pressure and gravity castings. Articles, that are castings of the alloys, are suitable for applications at temperatures as high as 175-250° C.

Abstract: A new class of light or reactive elements and monophase ??-matrix magnesium- and aluminum-based alloys with superior engineering properties, for the latter being based on a homogeneous solute distribution or a corrosion-resistant and metallic shiny surface withstanding aqueous and saline environments and resulting from the control during synthesis of atomic structure over microstructure to net shape of the final product, said ??-matrix being retained upon conversion into a cast or wrought form. The manufacture of the materials relies on the control of deposition temperature and in-vacuum consolidation during vapor deposition, on maximized heat transfer or casting pressure during all-liquid processing and on controlled friction and shock power during solid state alloying using a mechanical milling technique.

Abstract: A process for producing implants made of a bioresorbable metal, particularly magnesium alloys or zinc alloys, in which the material properties of the magnesium or the zinc are changed and the processing and utilization properties are improved by combining process steps for adjusting the properties of the material and subsequent machining. In this way it is possible to produce thin-walled tubular implants, particularly blood vessel support stents, from bioresorbable magnesium or zinc alloys, which are readily deformable without the risk of fracture during implantation.

Abstract: A sample is taken out of a molten magnesium alloy, the cooling curve of the sample during solidification is measured, the content of the aluminum component in the sample is determined by the use of the crystallization temperature of a phase appearing in the cooling curve, together with cooling curves, and if the results of bath analysis show the components to deviate from the standard values and target values, an aluminum-manganese master alloy, aluminum or magnesium is added to the molten magnesium alloy to adjust the components to an appropriate amount of aluminum or an appropriate iron/manganese ratio, whereby a magnesium alloy is produced.

Abstract: An article of manufacture made of a magnesium alloy is made by casting the magnesium alloy to provide a billet, forging the billet to render material of the billet to have an average crystalline particle size of not greater than 100 .mu.m; and carrying out a T6 treatment (a solution treatment and an artificial aging treatment) with respect to the billet. Physical properties such as, for example, the tensile strength, elongation and the like of the article are considerably improved by virtue of the synergistic effect of the micronized crystalline particles and the T6 treatment.

Abstract: A heat-resistant magnesium alloy containing, based on the total weight of the alloy, 4.5-10 wt. % of aluminum, 0.1-3 wt. % of calcium, 1-3 wt. % of a rare earth element and 0.2-1 wt. % of manganese and having a composition that the contents of aluminum, calcium and the rare earth element satisfy the relationship of the following expression (1):1.66+1.33 Ca+0.37 RE.ltoreq.Al.ltoreq.2.77+1.33 Ca+0.74 REwherein Ca, RE and Al represent the weight percentages of Ca, at least one rare earth element and aluminum contained in the alloy, respectively, in the relationship.

Abstract: Metal-matrix composites and methods for producing these composites are provided. The manufacturing methods include providing a ceramic preform having a uniform distribution of ceramic particles sintered to one another. The particles include an average particle size of no greater than about 3 microns, and at least one half of the volume of the preform is occupied by porosity. The preform is then disposed into a mold and contacted by molten metal. The molten metal is then forced into the pores of the preform and permitted to solidify to form a solid metal-matrix composite. This composite is machinable with a high-speed steel (HSS) bit for greater than about 1 minute without excessive wear occurring to the bit. This invention preferably employs metal-matrixes including Al, Li, Be, Pb, He, Au, Sn, Mg, Ti, Cu, and Zn. Preferred ceramics include oxides, borides, nitrides, carbides, carbon, or a mixture thereof. Inert gas pressures of less than about 3,000 psi can be used to easily infiltrate the preforms.

Abstract: The manufacturing method of plastically formed products prevents the generation of cracks at the time of plastic working, thereby increasing the productivity. It is also prevented that the metallic particles constituting the product become large and rough in structure. In the manufacturing method, only the compact treatment and the vacuum deaeration treatment are carried out prior to the extrusion treatment, without the pressure-heat treatment performed. Therefore, processing steps prior to the extrusion treatment are simplified, so that the productivity of the plastically formed products is improved and the metallic particles are prevented from being large and rough. The diffusion treatment between the extrusion treatment and the forging treatment enhances the adhesion at the inner part of the extruded material in the radial direction, whereby the generation of cracks at the time of plastic working is avoided.

Abstract: A method for producing a magnesium light alloy product. In order to enhance formability in plastically forming a magnesium alloy material and obtain high tensile strength and high proof stress in the final product, the magnesium alloy material is cast by using molten magnesium alloy containing strontium of 0.02 to 0.5 weight percent and then plastically formed into a magnesium light alloy product in set shape.

Abstract: A process for preparing a high strength magnesium alloy comprising heating a melt comprised of a base metal of magnesium, greater than 0.5% of lithium, and at least one alkali metal impurity selected from the group consisting of sodium, potassium, rubidium and cesium, the total alkali metal present in an amount greater than 5 ppm, to a temperature of about 50.degree. to 200.degree. C. above the melting point of alloy being refined in a vacuum for a sufficient time to reduce the aggregate concentration of alkali metal impurities in the melt to less than about 5 ppm as measured by GDMS.

Abstract: An article of manufacture made of a magnesium alloy is made by casting the magnesium alloy to provide a casting, forging the casting to render material of the casting to have an average crystalline particle size of not greater than 100 .mu.m, and carrying out a T6 treatment (a solution treatment and an artificial aging treatment) with respect to the casting. Physical properties such as, for example, the tensile strength, elongation and the like of the article are considerably improved by virtue of the synergistic effect of the micronized crystalline particles and the T6 treatment.

Abstract: A bearing component is prepared from a carburazing steel and having a surface hardness of 63 to 67 in terms of Rockwell hardness C and a surface retained austenite content of at least 20% to less than 25%. The bearing component is produced by a process including the step of carburizing and quenching a bearing component workpiece prepared from a carburizing steel and machined to a predetermined shape, the step of subjecting the resulting workpiece to a preliminary tempering treatment, the step of subjecting the tempered workpiece to a sub-zero treatment and the step of subjecting the treated workpiece to a main tempering treatment. Further, the bearing component is produced by another process including the step of carburizing and quenching a bearing component workpiece prepared from a carburizing steel and machined to a predetermined shape, the step of subjecting the resulting workpiece to a secondary hardening treatment and the step of subjecting the hardened workpiece to a main tempering treatment.

Abstract: Self-supporting bodies are produced by reactive infiltration of a parent metal into a boron donor material and a carbon donor material. The reactive infiltration typically results in a composite comprising a boron-containing compound, a carbon-containing compound and residual metal, if desired. The mass to be infiltrated may contain one or more inert fillers admixed with the boron donor material and carbon donor material. The relative amounts of reactants and process conditions may be altered or controlled to yield a body containing a wide ranging varying volume percentage of ceramic, metal, and porosity.

Abstract: Magnesium base metal alloy sheet is produced by rolling the rolling stock extruded or forged from a billet at a temperature ranging from 200.degree. C. to 300.degree. C. The billet is consolidated from rapidly solidified magnesium based alloy powder that consists of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium, and yttrium, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. The alloy has a uniform microstructure comprised of fine grain size ranging from 0.2-1.0 .mu.m together with precipitates of magnesium and aluminum containing intermetallic phases of a size less than 0.1 .mu.m.

Abstract: A complex part composed of rapidly solidified magnesium base metal alloy is produced by superplastic forming at a temperature ranging from 160.degree. C. to 275.degree. C. and at a rate ranging from 0.00021 m/sec to 0.00001 mm/sec, to improve the formability thereof and allow forming to be conducted at lower temperature. The rapidly solidified magnesium based alloy has a composition consisting essentially of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium and yttrium, "a" ranges from 0 to about 15 atom percent, "b" ranges from 0 to about 4 atom percent and "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. Such an alloy contains fine grain size and finely dispersed magnesium-, aluminum- rare earth intermetallic phases.

Abstract: Magnesium base metal alloy sheet is produced by rolling the rolling stock extruded or forged from a billet at a temperature ranging from 200.degree. C. to 300.degree. C. The billet is consolidated from rapidly solidified magnesium based alloy powder that consists of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium, and yttrium, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. The alloy has a uniform microstructure comprised of fine grain size ranging from 0.2-1.0 .mu.m together with precipitates of magnesium and aluminum containing intermetallic phases of a size less than 0.1 .mu.m.

Abstract: A complex part composed of rapidly solidified magnesium base metal alloy is produced by superplastic forming at a temperature ranging from 160.degree. C. to 275.degree. C. and at a rate ranging from 0.00021 m/sec. to 0.00001 m/sec., to improve the formability thereof and allow forming to be conducted at lower temperatures. The rapidly solidified magnesium based alloy has a composition consisting essentially of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium and yttrium, "a" range from 0 to about 15 atom percent, "b" ranges from 0 to about 4 atom percent and "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. Such an alloy contains fine grain size and finely dispersed magnesium-, aluminum- rare earth intermetallic phases.