Abstract: There is provided an ?-? type titanium alloy having a normal-temperature strength equivalent to, or exceeding that of a Ti-6Al-4V alloy generally used as a high-strength titanium alloy, and excellent in hot workability including hot forgeability and subsequent secondary workability, and capable of being hot-worked into a desired shape at a low cost efficiently. There is disclosed an ?-? type titanium alloy having high strength and excellent hot workability wherein 0.08-0.25% C is contained, the tensile strength at room temperature (25° C.) after annealing at 700° C. is 895 MPa or more, the flow stress upon greeble test at 850° C. is 200 MPa or less, and the tensile strength/flow stress ratio is 9 or more. A particularly preferred ?-? type titanium alloy comprises 3-7% Al and 0.08-025% C as ?-stabilizers, and 2.0-6.0% Cr and 0.3-1.0% Fe as ?-stabilizers.

Abstract: A method for absorbing and releasing hydrogen comprises applying repeatedly hydrogen pressurization and depressurization to a hydrogen storage metal alloy of a body-centered cubic structure-type phase exerting a two-stage or inclined plateau characteristic in a hydrogen storage amount vs hydrogen pressure relation in an appropriate fashion to absorb and release hydrogen. At least at one stage during the release of hydrogen, the temperature (T2) of the above-mentioned hydrogen storage metal alloy is made higher than the temperature (T1) of the hydrogen storage metal alloy during the hydrogen absorption process (T2>T1). This enables the release and utilization of occluded hydrogen at a low-pressure plateau region or an inclined plateau lower region.

Abstract: A composition comprises about 8 to about 12 wt % molybdenum, about 2.8 to about 6 wt % aluminum, up to about 2 wt % vanadium, up to about 4 wt % niobium, with the balance being titanium, wherein the weight percents are based on the total weight of the alloy composition. A method for making an article comprises cold-working a shape from a composition comprising about 8 to about 10 wt % molybdenum, about 2.8 to about 6 wt % aluminum, up to about 2 wt % vanadium, up to about 4 wt % niobium, with the balance being titanium, wherein the weight percents are based on the total weight of the alloy composition; solution heat treating the shape; and cooling the shape.

Abstract: The inventive titanium alloy comprises, expressed in mass %: aluminium 4.0-6.0; vanadium 4.5-5.0; molybdenum 4.5-5.0; chromium 2.0-3.6; ferrum 0.2-0.5; the rest being titanium. An equivalent molybdenum content is determined as corresponding to Moequiv.≧13.8. The total aluminum and zirconium content does not exceed 7.2. The inventive method for heat treatment consists in heating to t&bgr;<>&agr;+&bgr;−(30-70)° C., conditioning during 2-5 hrs. at that temperature, air or water cooling and age-hardening at a temperature ranging from 540° C. to 600° C. during 8-16 hrs. Said alloy has a high volumetric deformability and is used for manufacturing massive large-sized forged and pressed pieces having a high strength level, satisfactory characteristics of plasticity and fracture toughness.

Abstract: High strength alpha-beta alloy comprising essentially Al: 4.5-5.5%, V: 3.0-5.0%, Mo: 0.3-1.8%, Fe: 0.2-1.2%, oxygen 0.12-0.25% Ti: balance. All other incidental elements should be less than 0.1% for each element and less than 0.5% in total. The alloy possesses improved machinability and ballistic performance compared to Ti-6Al-4V.

Abstract: In order to improve castability of a titanium alloy, 0.01-5 wt %, preferably 0.1-3 wt %, of bismuth is introduced into the titanium alloy, based on the weight of bismuth and the titanium alloy. The titanium alloy is suitable for making a dental casting or a medical implant by casting.

Abstract: A biocompatible binary titanium-niobium (Ti—Nb) alloy having a low modulus and a high strength, and containing &agr;″ phase as a major phase is disclosed. The binary Ti—Nb alloy contains 10-30 wt % of Nb, preferably 13-28 wt % of Nb, and the balance titanium, which is suitable for making a medical implant such as an orthopedic implant or dental implant.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;″ phase as a major phase. The titanium alloy composition contains at least one isomorphous beta stabilizing element selected from Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9. The work piece is preferably a medical device.

Abstract: A high strength and ductility &agr;+&bgr; type titanium alloy, comprising at least one is isomorphous &bgr; stabilizing element in a Mo equivalence of 2.0-4.5 mass %, at least one eutectic &bgr; stabilizing element in an Fe equivalence of 0.3-2.0 mass %, Si in an amount of 0.1-1.5 mass %, and C in an amount of 0.01-0.15% mass, and has a &bgr; transformation temperature no lower than 940° C.

Abstract: This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogeneous mixture of the two or more alloys combined in powder form.

Abstract: Titanium-based alloy contains, % by mass: aluminum 2.2 to 3.8; vanadium 4.5 to 5.9; moloybdenum 4.5 to 5.9; chromium 2.0 to 3.6; iron 0.2 to 0.8; zirconium 0.0l to 0.08; carbon 0.01 to 0.25; oxygen 0.03 to 0.25; titanium being the balance. The alloy possesses high ability to volume deformation in cold state (is easily rolled into rods), does not have tendency to form high-melting inclusions and is efficiently enforced with thermal treatment with obtaining of high level of strength and plasticity characteristics.

Abstract: A super-elastic titanium alloy for medical use consisting essentially of:

Abstract: A reversible hydrogen storage alloy capable of absorbing approximately 4 weight percent hydrogen and desorbing up to 2.8 weight percent hydrogen at temperatures up to 100° C. The hydrogen storage alloy is generally composed of titanium, vanadium, chromium, and manganese. Additional elements such as zirconium, yttrium, iron, nickel, zinc, molybdenum, and tantalum may also be included in the alloy.

Abstract: A modified Ti—Mn2 hydrogen storage alloy. The alloy generally is comprised of Ti and Mn. A generic formula for the alloy is: TiQ−XZrXMnZ−YAY, where A is generally one or more of V, Cr, Fe, Ni and Al. Most preferably A is one or more of V, Cr, and Fe. The subscript Q is preferably between 0.9 and 1.1, and most preferably Q is 1.0. The subscript X is between 0.0 and 0.35, more preferably X is between 0.1 and 0.2, and most preferably X is between 0.1 and 0.15. The subscript Y is preferably between 0.3 and 1.8, more preferably Y is between 0.6 and 1.2,and most preferably Y is between 0.6 and 1.0. The subscript Z is preferably between 1.8 and 2.1,and most preferably Z is between 1.8 and 2.0. The alloys are generally single phase materials, exhibiting a hexagonal C14 Laves phase crystalline structure.

Abstract: The present invention provides a low alloying element-doped titanium and a casting cast therefrom. The doped titanium of the present invention includes titanium and from about 0.01 to 3 percent by weight of an alloying metal selected from the group consisting of bismuth, silver, hafnium, tantalum, molybdenum, tin, niobium, chromium and copper based on the weight of the titanium. The doped titanium of the present invention has improved castability and a decreased surface tension compared with pure titanium.

Abstract: A high strength and ductility &agr;+&bgr; type titanium alloy, comprising at least one is isomorphous &bgr; stabilizing element in a Mo equivalence of 2.0-4.5 mass %, at least one eutectic &bgr; stabilizing element in an Fe equivalence of 0.3-2.0 mass %, Si in an amount of 0.1-1.5 mass %, and C in an amount of 0.01-0.15% mass, and has a &bgr; transformation temperature no lower than 940° C.

Abstract: The present invention relates to Ti—Zr—Mn—Cr based Laves Phase hydrogen storage alloy having high hydrogen storage capacity, and excellent slopping and hysterisis characteristics. In the Ti—Zr—Mn—Cr based Laves Phase hydrogen storage alloy, the hydrogen storage alloy has a composition of (Ti1−xZrx)1+AMn2−yCry, and has a non-stoichiometry composition because A is larger than 0.

Abstract: This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogeneous mixture of the two or more alloys combined in powder form.

Abstract: A hydrogen storage alloy having a body-centered cubic structure phase capable of storing and releasing hydrogen as its main phase, and a composition of the general composition formula: Ti(100-a-0.4b)Cr(a-0.6b)Mb, wherein M is at least one element of Mo and W; and 20≦a(at %)≦80 and 0≦b (at %)<5.

Abstract: TiAl alloy includes 46 to 50 at % of Al, 5 at % or less of combination of Mo, V and Si, provided that Si content is 0.7 at % or less, and Mo content satisfies an equation of −0.3x+17.5 at % or less where x represents Al (at %), and the remainder being Ti and inevitable impurities. Mo may be replaced by Fe or combination of Mo and Fe. TiAl alloy is heated to a melt, poured into a mold, and cooled at a rate of 150 to 250° C./min within a temperature range of 1500 to 1100° C. The resulting product can be used as cast. If desired, however, heat treatment such as HIP or homogenization may be performed within a temperature range of 1100 to 800° C. After the heat treatment, the melt is cooled at a rate of 100° C./min or more until room temperature.

Abstract: In order to improve castability of a titanium alloy, 0.1-5 wt %, preferably 0.5-3 wt %, of bismuth is doped, based on the weight of bismuth and the titanium alloy. The titanium alloy is for making a dental casting or a medical implant.

Abstract: A biocompatible titanium alloy with low modulus comprising &agr;″ phase as a major phase and containing from about 6 to about 9 wt % of molybdenum, from 0 to about 1 wt % of an alloying element and the balance titanium. The alloying element is niobium and/or zirconium. The biocompatible titanium alloy is suitable for use as a material for a medical prosthetic implant.

Abstract: A process is provided for the production of porous non-evaporable getter materials comprising at least one first element selected from Zr and Ti and at least one second element selected from V, Cr, Mn and Ni. The starting metal powders are produced by reduction of the corresponding oxides, with calcium hydride and the thus obtained powders are compacted and sintered at a value of pressure and temperature in a given range. The getter materials due to the production process, have a novel distribution of chemical composition through the getter body, resulting in an improved combination of mechanical and gas-sorption properties.

Abstract: Dental and orthodontic articles comprising alloys of a material selected from the group consisting of Ti, Zr, Si, Mo, Co, Nb and Be. The alloys may further include at least one secondary alloying element selected from the group consisting of Ta, Cr, Al, V, Pd, Hf and Fe. The alloys preferably comprise a primary constituent in the range of about 30-85% by weight of the alloy, a secondary alloying component in the range of about 0.5-10% by weight, and the alloy has a modulus of elasticity in the range of about 5 million to 15 million psi.

Abstract: The present invention relates to a sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in general finishing cutting operations requiring high deformation resistance in combination with relatively high toughness. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Abstract: A sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in light finishing cutting operations at high cutting speed. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Abstract: It is described a process for the production of porous non-evaporable getter materials comprising at least one first element selected between Zr and Ti and at least one second element selected among V, Cr, Mn and Ni, wherein the starting metal powders are produced by reduction with calcium hydride of the corresponding oxides and the thus obtained powders are compacted and sintered at a value of pressure and temperature in a given range; also described are getter materials that, due to the production process, have a novel distribution of chemical composition through the getter body resulting in an improved combination of mechanical and gas-sorption properties.

Abstract: This invention relates to a TiAl intermetallic compound-based alloy exhibiting excellent heat resistance, oxidation resistance and resonance resistance and having a cast structure composed of fine equiaxed grains. Specifically, it relates to a TiAl intermetallic compound-based alloy comprising of 45 to 48 atomic percent of Al, 5 to 9 atomic percent of Nb, 1 to 2 atomic percent of Cr, 0.2 to 0.5 atomic percent of Si, 0.3 to 2 atomic percent of Ni, 0.01 to 0.05 atomic percent of Y, and the balance being Ti and incidental impurities, the alloy exhibiting excellent heat resistance, oxidation resistance and resonance resistance and having a cast structure formed of fine equiaxed grains.

Abstract: Dental and orthodontic articles comprising alloys of a material selected from the group consisting of T, Zr, Si, Mo, Co, Nb and Be. The alloys may further include at least one secondary alloying element selected from the group consisting of Ta, Cr, Al, V, Pd, Hf and Fe. The alloys preferably comprise a primary constituent in the range of about 30-85% by weight of the alloy, a secondary alloying component in the range of about 0.5-10% by weight, and the alloy has a modulus of elasticity in the range of about 5 million to 15 million psi.

Abstract: A modified Ti—V—Zr—Ni—Mn—Cr electrochemical hydrogen storage alloy which has at least one of the following characteristics: 1) an increased charge/discharge rate capability over that the base Ti—V—Zr—Ni—Mn—Cr electrochemical hydrogen storage alloy; 2) a formation cycling requirement which is reduced to one tenth that of the base Ti—V—Zr—Ni—Mn—Cr electrochemical hydrogen storage alloy; or 3) an oxide surface layer having a higher electrochemical hydrogen storage catalytic activity than the base Ti—V—Zr—Ni—Mn—Cr electrochemical hydrogen storage alloy.

Abstract: A high strength and ductility &agr;+&bgr; type titanium alloy, comprising at least one isomorphous &bgr; stabilizing element in a Mo equivalence of 2.0-4.5 mass %, at least one eutectic &bgr; stabilizing element in an Fe equivalence of 0.3-2.0 mass %, and Si in an amount of 0.1-1.5 mass %, and optionally comprising C in an amount of 0.01-0.15 % mass.

Abstract: This invention describes a corrosion-resistant, high-strength, low-modulus, titanium based alloy having about 5-11 weight percent Mo and about 6-15 weight percent Hf. This alloy is suitable for use in the fabrication of articles for medical and non-medical applications having low modulus, improved corrosion resistance and surface hardening. To increase strength, Cr, Si and Fe can be added in small amounts as well as increasing levels of interstitial oxygen, nitrogen or carbon. To maintain low elastic modulus, Mo can be partially substituted by Nb.

Abstract: A hydrogen-absorbing alloy capable of controlling the very fine structure formed by a spinodal decomposition for improving flatness of an emission equilibrium pressure in a practical temperature/pressure range and excellent in activation and hydrogen absorption/desorption amounts, and a production method thereof. The hydrogen-absorbing alloy has a composition expressed by the general formula Ti.sub.x Cr.sub.y V.sub.z (where each of x, y and z represents an atomic percent and satisfies the relation x+y+z=100), wherein the composition has a body-centered cubic structural phase as a principal phase, the principal phase exists within the range in which the body-centered cubic structure appears and a spinodal decomposition occurs with the exception of a C14 (a typical structure of the Laves phase; a MgZn.sub.2 type crystal structure) mono-phase range, and has a regular periodical structure formed by the spinodal decomposition, and its apparent lattice constant is at least 0.2950 nm but is not greater than 0.

Abstract: A titanium-based intermetallic alloy having a high yield stress, a high creep resistance and sufficient ductility at ambient temperature has the following chemical composition as measured in atomic percentages:Al, from 16 to 26; Nb, from 18 to 28; Mo, from 0 to 2; Si, from 0 to 0.8; Ta, from 0 to 2; Zr, from 0 to 2; and Ti as the balance to 100; with the condition that Mo+Si+Zr+Ta>0.4%.Production, working and heat-treatment ranges adapted to the intended use of the material are also defined.

Abstract: A high strength, high ductility titanium alloy comprising O, N and Fe as strengthening elements and the balance substantially Ti, the contents of the strengthening elements satisfying the following relationships (1) to (3):(1) from 0.9 to 2.3% by weight of Fe,(2) up to 0.05% by weight of N, and(3) an oxygen equivalent value Q, which is defined by the formula mentioned below, of 0.34 to 1.00Q=[O]+2.77[N]+0.1[Fe]wherein [O] is an oxygen content (% by weight), [N] is a nitrogen content (% by weight) and [Fe] is an iron content (% by weight), the titanium alloy having a tensile strength of at least 700 MPa and an elongation of at least 15%. Part of Fe may be replaced with Cr and/or Ni. Fe, Cr and Ni may be introduced from a carbon steel or stainless steel, or they may be introduced from sponge titanium containing these elements.

Abstract: This invention describes a biocompatible, radiopaque, high-strength, low-modulus, titanium based alloy having about 2-30 weight percent Mo and up to about 30 weight percent Hf. This alloy is suitable for use in the fabrication of medical implants and devices having low modulus, improved corrosion resistance and surface hardening. To increase strength, Cr, Si and Fe can be added in small amounts as well as increasing levels of interstitial oxygen, nitrogen or carbon. To maintain low elastic modulus, Mo can be partially substituted by Nb.

Abstract: A titanium alloy having improved heat resistance in addition to the inherent properties of lightness and corrosion resistance. The alloy consists essentially of, by weight %, Al: 5.0-7.0%, Sn: 3.0-5.0%, Zr: 2.5-6.0%, Mo: 2.0-4.0%, Si: 0.05-0.80%, C: 0.001-0.200%, O: 0.05-0.20%, optionally further one or two of Nb and Ta: 0.3-2.0%, and the balance of Ti and inevitable impurities. A method of producing parts from this alloy comprises subjecting the titanium alloy of the above described alloy composition to heat treatment at a temperature of .beta.-region, combination of rapid cooling and slow cooling or combination of water quenching and annealing, hot processing in .alpha.+.beta. region, solution treatment and aging treatment.

Abstract: Dental and orthodontic articles comprising alloys of a material selected from the group consisting of Ti, Zr, Si, Mo, Co, Nb and Be. The alloys may further include at least one secondary alloying element selected from the group consisting of Ta, Cr, Al, V, Pd, Hf and Fe. The alloys preferably comprise a primary constituent in the range of about 30-85% by weight of the alloy, a secondary alloying component in the range of about 0.5-10% by weight, and the alloy has a modulus of elasticity in the range of about 5 million to 15 million psi.

Abstract: Disordered multicomponent hydrogen storage material characterized by extraordinarily high storage capacity due to a high density of useable hydrogen storage sites (greater than 10.sup.23 defect sites/cc) and/or an extremely small crystallite size. The hydrogen storage material can be employed for electrochemical, fuel cell and gas phase applications. The material may be selected from either of the modified LaNi.sub.5 or modified TiNi families formulated to have a crystallite size of less than 200 Angstroms and most preferably less than 100 Angstroms.

Abstract: Addition of Mo to a Zr--Mn--V--Cr--Co--Ni, a Zr--Mn--Cr--Co--Ni hydrogen storage alloy, or those including Ti as substitution for Zr improves high-rate discharge characteristics of the hydrogen storage alloy at low temperatures. The hydrogen storage alloy is of the general formula ZrMn.sub.a V.sub.b Mo.sub.c Cr.sub.d Co.sub.e Ni.sub.f, wherein 0.4.ltoreq.a.ltoreq.0.8, 0.ltoreq.b<0.3, 0<c.ltoreq.0.3, 0<d.ltoreq.0.3, 0<e.ltoreq.0.1, 1.0.ltoreq.f.ltoreq.1.5, 0.1.ltoreq.b+c.ltoreq.0.3, and 2.0.ltoreq.a+b+c+d+e+f.ltoreq.2.4, or Zr.sub.1-x Ti.sub.x Mn.sub.a V.sub.b Mo.sub.c Cr.sub.d Co.sub.e Ni.sub.f, wherein 0<x.ltoreq.0.5, 0.4.ltoreq.a.ltoreq.0.8, 0.ltoreq.b<0.3, 0<c.ltoreq.0.3, 0<d.ltoreq.0.3, 0<e.ltoreq.0.1, 1.0.ltoreq.f.ltoreq.1.5, 0.1.ltoreq.b+c.ltoreq.0.3, x.ltoreq.b+c+d+e, and 1.7.ltoreq.a+b+c+d+e+f.ltoreq.2.2 or Zr.sub.1- Ti.sub.x Mn.sub.a Mo.sub.c M.sub.y Cr.sub.d Ni.sub.f, wherein M is at least one selected from the group consisting of Fe, Cu, and Zn, and wherein 0<x.ltoreq.

Abstract: The present invention provides an improved hydrogen storage alloy of Ti--V--Ni system having a body-centered cubic structure. The alloy is of the general formula Ti.sub.x (V.sub.a Cr.sub.1-a).sub.1-x M.sub.b Ni.sub.c, wherein M represents at least one element of La and Ce or a mischmetal, and wherein 0.5.ltoreq.a.ltoreq.0.95, 0.01.ltoreq.b.ltoreq.0.1, 0.1.ltoreq.c.ltoreq.0.6, and 0.2.ltoreq.x.ltoreq.0.4; or Ti.sub.x V.sub.y M.sub.z Ni.sub.1-x-y-z, wherein M represents at least one element selected from the group consisting of Co, Fe, Cu, and Ag, and wherein 0.2.ltoreq.x.ltoreq.0.4, 0.3.ltoreq.y.ltoreq.0.7, 0.1.ltoreq.z.ltoreq.0.3, and 0.6.ltoreq.x+y+z.ltoreq.0.95.

Abstract: This invention relates to a titanium alloy anode for the electrolytic production of manganese dioxide, wherein the alloy anode is made of titanium as a base metal, and comprises at least three other metals selected from the group consisting of manganese, chromium, iron, silicon, aluminum, cerium, neodymium and mischmetal; the addition of which may be within the range of 8 to 20 weight percent based on the weight of the total composition. The alloy anode, being easy to manufacture and having irregular sectional profiles, is free from severe passivation during electrolytic production using high current density due to its combined properties. The alloy anode, being highly resistant to corrosion by the electrolysis solution, requires no activation treatment during the electrolytic process. The purposefully-designed shapes of the anode permit good attachment of the deposited product layer and prevent the deposition from cracking and peeling-off.

Abstract: A hydrogen occlusion electrode comprising a compact of a mixture powder including a titanium-nickel alloy which contains oxygen.

Abstract: Creep resistant gamma titanium alumninide comprising titanium in the range of about 55 to about 71 weight % and aluminum in the range of 29 to about 35 weight % by virtue of including oxygen intentionally in the composition in an effective amount to significantly increase the high temperature creep resistance of the alloy. The composition can include greater than about 800 ppm up to about 1500 ppm oxygen to this end.

Abstract: TiAl-based intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.

Abstract: Bulk nanocrystalline Ti-based alloys were produced by conventional cooling from the corresponding liquid or high temperature solid phase followed by annealing at an appropriate temperature for a certain amount of time. The titanium-based alloys have a composition represented by the following formula, Ti.sub.a Cr.sub.b Cu.sub.c M.sub.d whereinM is at least one metal element selected from the group consisting of Mn, Mo, Fe.a, b, c, and d are atomic percentages falling within the following ranges:60<a<90, 2<b<20, 2<c<25, and 1<d<15.Generally, the titanium-based alloys are in a nanocrystalline state, sometimes coexisting with an amorphous phase. These titanium-based alloys are economically produced, free of porosity and high strength (twice as that of commercial alloys) with good ductility. Furthermore, these bulk nanocrystalline alloys can be made in large-sized ingots, thermally recycled and have good processability. These properties make these alloys suitable for various applications.

Abstract: A titanium matrix composite having eutectically formed titanium-ceramic reinforcement containing at least two of the elements of silicon, aluminum, zirconium, manganese, chromium, molybdenum, carbon, iron, boron, cobalt, nickel, germanium and copper.

Abstract: A dental care material comprising a titanium sintered body has no harmful effects on the human body and easily produces products with complicated shapes having a high level of strength. A mixture of titanium powder and an organic binder is injection molded and subjected to binder removal and sintering processes to form a bracket for orthodontic or dental implant materials. Pure titanium powder, with an average granule diameter of no more than 40 .mu.m, a carbon content by weight of no more than 0.3%, and an oxygen content by weight of no more than 0.6%, preferably is used to produce a titanium sintered body of combined carbon and oxygen content by weight of no more than 1.0%. Colored layers can be formed on the surface of the titanium sintered body using various methods as needed.

Abstract: A titanium matrix composite having eutectically formed titanium alloy reinforcement containing at least two of the elements of silicon, aluminum, zirconium, manganese, chromium, molybdenum, carbon, iron, boron, cobalt, nickel, germanium and copper.

Abstract: A high strength and ductility &agr;+&bgr; type titanium alloy, comprising at least one isomorphous &bgr; stabilizing element in a Mo equivalence of 2.0-4.5 mass %, at least one eutectic &bgr; stabilizing element in an Fe equivalence of 0.3-2.0 mass %, and Si in an amount of 0.1-1.5 mass %, and optionally comprising C in an amount of 0.01-0.15% mass.