Abstract: To provide a forged aluminum alloy excellent in creep characteristics and a manufacturing method for the forged aluminum alloy. A forged aluminum alloy contains Si: 0.10-0.25 mass %, Fe: 0.9-1.3 mass %, Cu: 1.9-2.7 mass %, Mg: 1.3-1.8 mass %, Zn: 0.10 mass % or less, Ni: 0.9-1.2 mass %, and Ti: 0.01-0.1 mass %, with the balance being Al and inevitable impurities, in which the total content of Fe and Ni is 2.2 mass % or less, the total content of Mn, Cr, and Zr is 0.20 mass % or less, the average equivalent circle diameter of an intermetallic compound is 4.5 ?m or less, and variation of distance between the intermetallic compounds in the ST direction is 2.3 or less.

Abstract: Provided is a hot-forged 6xxx-series aluminum alloy having excellent corrosion resistance and still having both high strength and good ductility. A forged 6xxx-series aluminum alloy having a specific chemical composition after solution treatment is further subjected to warm working to introduce dislocations into the forged aluminum alloy microstructure. This allows the forged aluminum alloy after artificial aging to have a microstructure which has a high dislocation density, includes a large proportion of small angle grain boundaries, and has a high average number density of precipitates. Thus, the resulting forged aluminum alloy has a 0.2% yield strength of 400 MPa or more and an elongation of 10% or more and combines properties necessary for suspension parts.

Abstract: The aluminum alloy forged material for an automobile according to the present invention is composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.5 mass % or less, Cu: 0.1-0.6 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.25-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, with the remainder being Al and inevitable impurities, wherein the aluminum alloy forged material has an area ratio the <111> texture of 60% or more in a cross section parallel to the extrusion direction.

Abstract: An aluminum alloy forged material for automotive vehicles comprises 0.6˜1.2 mass % of Mg, 0.7˜1.5 mass % of Si, 0.1.˜0.5 mass % of Fe, 0.01˜0.1 mass % of Ti, 0.3˜1.0 mass % of Mn, at least one of 0.1˜0.4 mass % of Cr and 0.05˜0.2 mass % of Zr, a restricted amount of Cu that is less than or equal to 0.1 mass %, a restricted amount of Zn that is less than or equal to 0.05 mass %, a restricted amount of H that is less than or equal to 0.25 ml in 100 g Al and a remainder of Al and inevitably contained impurities, and the material includes precipitated crystalline particles among which the largest one has a maximum equivalent circle diameter equal to or less than 8 ?m and an area ratio of the precipitated crystalline particles is equal to or less than 3.6%.

Abstract: An object of the present invention is to provide a 6000-series aluminum alloy material for a high-pressure gas container which has both of resistance to hydrogen embrittlement and mechanical properties. In the aluminum alloy material for a high-pressure gas container, the contents of Fe, Mn and Cu fall within narrower ranges than the standard composition of AA6066 alloy. The aluminum alloy material is produced to have a structure in which a predetermined amount of fine dispersed particles are dispersed therein and coarse crystallized materials are small, and therefore strength and resistance to hydrogen embrittlement are improved, which are required for a high-pressure gas container.

Abstract: An aluminum alloy material for a high-pressure hydrogen gas container contains 0.6 to 1.5 mass % of Si, 0.6 to 1.6 mass % of Mg, 0.1 to 1.0 mass % of Cu, 0.05 to 0.4 mass % of Fe, 0.9 mass % or less of Mn, 0.3 mass % or less of Cr, 0.15 mass % or less of Zr, 0.2 mass % or less of V, 0.25 mass % or less of Zn, and 0.1 mass % or less of Ti, with the balance being Al and inevitable impurities. The total content of Mn, Cr, Zr, and V is 0.05 mass % or more. The material has a yield strength S (MPa) of 270 MPa or more and an electrical conductivity E (IACS %) of 36 IACS % or more and satisfies formulae (1) and (2): (1) S??10.46×E+801, (2) S??25×E+1296.

Abstract: The aluminum alloy forged material for an automobile according to the present invention is composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.5 mass % or less, Cu: 0.1-0.6 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.25-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, with the remainder being Al and inevitable impurities, wherein the aluminum alloy forged material has an area ratio the <111> texture of 60% or more in a cross section parallel to the extrusion direction.

Abstract: An object of the present invention is to provide a 6000-series aluminum alloy material for a high-pressure gas container which has both of resistance to hydrogen embrittlement and mechanical properties. In the aluminum alloy material for a high-pressure gas container, the contents of Fe, Mn and Cu fall within narrower ranges than the standard composition of AA6066 alloy. The aluminum alloy material is produced to have a structure in which a predetermined amount of fine dispersed particles are dispersed therein and coarse crystallized materials are small, and therefore strength and resistance to hydrogen embrittlement are improved, which are required for a high-pressure gas container.

Abstract: There are provided an aluminum alloy forging having high strength, toughness, and resistance to corrosion in response to the thinning of automotive underbody parts, and a process for production thereof. The aluminum alloy forging includes an aluminum alloy containing predetermined amounts of Mg, Si, Mn, Fe, Zn, Cu, Cr, Zr, and Ti with the balance being composed of Al and inevitable impurities, and having a hydrogen gas concentration of 0.25 ml/100 g of Al. In the aluminum alloy forging mentioned above, the area ratio of Mg2Si having a maximum length of 0.1 ?m or above is 0.15% or below, the recrystallization ratio of the aluminum alloy is 20% or below, and a size distribution index value defined by V/r of dispersed particles of the aluminum alloy (V: the area ratio [%] of the dispersed particles, and r: the average radius [nm] of the dispersed particles) is 0.20 or above.

Abstract: The present invention provides an aluminum alloy forging material having enhanced strength, toughness, and corrosion resistance, and a method of producing the material. An aluminum alloy forging material 1 produced with specified components under specified conditions has an arm portion 2 including a relatively narrow and thick peripheral rib 3 and a thin and relatively wide central web 4 having a thickness of 10 mm or less and having a substantially H-shaped sectional form.

Abstract: An extruded member of Al—M13 Si aluminum alloy specially composed of Mg, Si, Fe, Cu, Zn, Ti, etc. which has the equiaxed re-crystallized grain structure in which intergranular precipitates 1 ?m or larger are separate from one another at large average intervals and there are many cube orientations over the entire thickness region thereof so that it excels in both flexural crushing performance and corrosion resistance. The extruded member is suitable for use as automotive body reinforcement members which need outstanding lateral crushing performance under severe collision conditions as well as good corrosion resistance.

Abstract: There are provided an aluminum alloy forging having high strength, toughness, and resistance to corrosion in response to the thinning of automotive underbody parts, and a process for production thereof. The aluminum alloy forging includes an aluminum alloy containing predetermined amounts of Mg, Si, Mn, Fe, Zn, Cu, Cr, Zr, and Ti with the balance being composed of Al and inevitable impurities, and having a hydrogen gas concentration of 0.25 ml/100 g of Al. In the aluminum alloy forging mentioned above, the area ratio of Mg2Si having a maximum length of 0.1 ?m or above is 0.15% or below, the recrystallization ratio of the aluminum alloy is 20% or below, and a size distribution index value defined by V/r of dispersed particles of the aluminum alloy (V: the area ratio [%] of the dispersed particles, and r: the average radius [nm] of the dispersed particles) is 0.20 or above.

Abstract: An extruded member of Al—Mg—Si aluminum alloy specially composed of Mg, Si, Fe, Cu, Zn, Ti, etc. which has the equiaxed re-crystallized grain structure in which intergranular precipitates 1 ?m or lager are separate from one another at large average intervals and there are many cube orientations over the entire thickness region thereof so that it excels in both flexural crushing performance and corrosion resistance. The extruded member is suitable for use as automotive body reinforcement members which need outstanding lateral crushing performance under severe collision conditions as well as good corrosion resistance.

Abstract: The present invention provides an aluminum alloy forging material having enhanced strength, toughness, and corrosion resistance, and a method of producing the material. An aluminum alloy forging material 1 produced with specified components under specified conditions has an arm portion 2 including a relatively narrow and thick peripheral rib 3 and a thin and relatively wide central web 4 having a thickness of 10 mm or less and having a substantially H-shaped sectional form.

Abstract: High strength and high toughness aluminum alloy forgings having, as a whole, a strength at &sgr;0.2 of 315 N/mm2 or more and an impact shock value of 20 J/cm2 or more, wherein the aluminum alloy material contains Mg: 0.6-1.6%, Si: 0.8-1.8%, Cu: 0.1-1.0%, Fe: 0.30% or less, one or more of Mn: 0.15-0.6%, Cr: 0.1-0.2% and Zr: 0.1-0.2%, and the balance of Al and inevitable impurities, wherein the volume fraction of total constituents phase particles (Mg2Si and Al—Fe—Si—(Mn, Cr, Zr) series intermetallic compounds) in the aluminum alloy structure in the forgings is 1.5% or less per unit area.

Abstract: A heat treatable 7000 series aluminum alloy has a micro-structure with a crystal grain size of 45 .mu.m or less and an aspect ratio (longitudinal/long transverse ratio of crystal grain) of preferably 4 or less, whereby its corrosion resistance is improved outstandingly by applying a solution heat treatment and hardening and subsequently, applying an aging treatment at 100 to 145.degree. C. for 5 to 50 hr, a reversion treatment at 140 to 195.degree. C. for 0.5 to 30 hr. and a re-aging treatment at 100 to 145.degree. C. for 5 to 50 hr. to thereby make an electroconductivity to 38-40 IACS %, and render the micro-structure so as to have a minimum distance for the .eta. phase on the crystal grain boundary of 20 nm or more and a maximum size for the .eta.' phase in the crystal grain of 20 nm or less.

Abstract: There is provided Al alloys which have improved and excellent fracture toughness and fatigue characteristic and improved formability, and which can be suitably used for transportation machines, such as aircraft, railway vehicles, general mechanical parts and the like. The Al alloy contains 1 to 8% (% by weight, the same is true for the following) of Cu, containing one or more selected from a group comprising 0.4 to 0.8% of Mn, 0.15 to 0.3% of Cr, 0.05 to 0.1% of Zr and 0.1 to 2.5% of Mg, Fe and Si each being less than 0.1%, a distance between constituents being more than 85 .mu.m, and having a micro-structure fulfilling at least one of the following (a) to (c):(a) the size of Al--Mn dispersoids is 4000 .ANG. or more,(b) the size of Al--Cr dispersoids is 1000 .ANG. or more, and(c) the size of Al--Zr dispersoids is 300 .ANG. or more.