Abstract: A magnesium alloy which has excellent tensile strength and elongation at a room temperature, as well as an excellent heat resistance represented by creep resistance is obtained. The magnesium alloy is produced which comprises 3.0% by mass or more and less than 6.0% by mass of Al, 0.10% by mass or more and 0.60% by mass or less of Mn, more than 0.50% by mass and less than 2.0% by mass of Ca, and more than 0.10% by mass and less than 0.40% by mass of Si, and has a balance composed of Mg and unavoidable impurities.

Abstract: A degradable structural member made of a magnesium alloy is produced, the degradable structural member having a sufficient strength and being degradable at a proper timing in an aqueous environment. The magnesium alloy used (i) contains not less than 7.0% by mass and not more than 13.0% by mass of Al, not less than 4.5% by mass and not more than 13.0% by mass of Cu, and not less than 0% by mass and less than 0.10% by mass of Mn, with the balance being Mg and unavoidable impurities; and (ii) includes finely dispersed intermetallic compounds.

Abstract: A magnesium alloy which has excellent tensile strength and elongation at a room temperature, as well as an excellent heat resistance represented by creep resistance is obtained. The magnesium alloy is produced which comprises 3.0% by mass or more and less than 6.0% by mass of Al, 0.10% by mass or more and 0.60% by mass or less of Mn, more than 0.50% by mass and less than 2.0% by mass of Ca, and more than 0.10% by mass and less than 0.40% by mass of Si, and has a balance composed of Mg and unavoidable impurities.

Abstract: A magnesium alloy contains, in atomic percent: 5.7 at. % or more and 8.6 at. % or less of Al; 0.6 at. % or more and 1.7 at. % or less of Ca; 0.05 at. % or more and 0.27 at. % or less of Mn; and 0.02 at. % or more and 0.36 at. % or less of a rare earth element (RE); and any one of 0.1 at. % or more and 0.3 at. % or less of Zn and 0.02 at. % or more and 0.18 at. % or less of Sn, wherein the contents in atomic percent satisfy the condition of the inequality of the following Formula (1), and the balance is Mg and inevitable impurities. (Ca+RE)/Al>0.

Abstract: An improved Al—Mn-based magnesium alloy is provided which shows excellent heat resistance, creep resistance, and mechanical strength in a balanced manner. The magnesium alloy contains 4.0% by mass or more and 8.50% by mass or less of Al; 0.1% by mass or more and 0.6% by mass or less of Mn; 1.5% by mass or more and 6.0% by mass or less of Ca; and 0.1% by mass or more and 0.5% by mass or less of Sn; the balance being Mg and unavoidable impurities.

Abstract: A first metal sheet is placed on a backing metal plate, and an end portion of a second metal sheet is placed on top of an end portion of the first metal sheet such that the ends of the end portions are spaced apart from each other by a predetermined distance in side view. The end portions of the first and second metal sheets are joined together by downwardly pressing a rotating rotary tool onto the end portion of the second metal sheet placed on top of the end portion of the first metal sheet and by utilizing frictional heat and pressurizing force generated between the rotating tool and the first and second metal sheets.

Abstract: A degradable Mg alloy containing: 3.9% by mass or more and 14.0% by mass or less of Al, from 0.1% by mass or more and 0.6% by mass or less of Mn, and 0.0% by mass or more and 1.0% by mass or less of Zn; 0.01% by mass or more and 10.0% by mass or less of Ni, Cu, or both of Ni and Cu; and the balance consisting of Mg and inevitable impurities is used to manufacture a degradable structural member made of a magnesium alloy having sufficient strength and degrading at an appropriate timing in an aqueous environment.

Abstract: A magnesium alloy contains, in atomic percent: 5.7 at. % or more and 8.6 at. % or less of Al; 0.6 at. % or more and 1.7 at. % or less of Ca; 0.05 at. % or more and 0.27 at. % or less of Mn; and 0.02 at. % or more and 0.36 at. % or less of a rare earth element (RE); and any one of 0.1 at. % or more and 0.3 at. % or less of Zn and 0.02 at. % or more and 0.18 at. % or less of Sn, wherein the contents in atomic percent satisfy the condition of the inequality of the following Formula (1), and the balance is Mg and inevitable impurities. (Ca+RE)/Al>0.

Abstract: An improved Al—Mn-based magnesium alloy is provided which shows excellent heat resistance, creep resistance, and mechanical strength in a balanced manner. The magnesium alloy contains 4.0% by mass or more and 8.50% by mass or less of Al; 0.1% by mass or more and 0.6% by mass or less of Mn; 1.5% by mass or more and 6.0% by mass or less of Ca; and 0.1% by mass or more and 0.5% by mass or less of Sn; the balance being Mg and unavoidable impurities.

Abstract: A production method of an extrusion billet includes a step of preparing a plate or lump starting material comprising a magnesium alloy, a step of performing a plastic deformation process at a rolling reduction of 70% or more to the starting material at a temperature of 250° C. or lower to introduce a strain without generating dynamic recrystallization, a step of producing powder by granulating the material after the plastic deformation process, and a step of producing a powder billet by compressing the powder.

Abstract: A plurality of short light metal billets obtained by pressing light metal pieces are stacked in a long container having an inside diameter D that is larger than an outside diameter d of each of the short light metal billets, are pressed in the long container at a temperature higher than room temperature, and are compressed until the outside diameter d of each of the short light metal billets becomes equal to the inside diameter D of the long container, thereby joining the short light metal billets together at an interface between each adjacent pair of the short light metal billets by friction.

Abstract: A plurality of short light metal billets 1 obtained by pressing light metal pieces are stacked in a long container 2 having an inside diameter D that is larger than an outside diameter d of each of the short light metal billets 1, are pressed in the long container 2 at a temperature higher than room temperature, and are compressed until the outside diameter d of each of the short light metal billets 1 becomes equal to the inside diameter D of the long container 2, thereby joining the short light metal billets 1 together at an interface 4 between each adjacent pair of the short light metal billets 1 by friction.

Abstract: A method for manufacturing a magnesium alloy material includes the steps of: preparing a sheet or block of starting material that is made of a magnesium alloy; subjecting the starting material to a plastic working process at a temperature of 250° C. or less and a reduction ratio of 70% or more to introduce strain without causing dynamic recrystallization; pulverizing the material subjected to said plastic working process into powder; compressively deforming said powder by passing said powder between a pair of rotating rolls; and successively crushing the compressively deformed powder, which has passed between the pair of rotating rolls, into granular powder.

Abstract: A production method of an extrusion billet includes a step of preparing a plate or lump starting material comprising a magnesium alloy, a step of performing a plastic deformation process at a rolling reduction of 70% or more to the starting material at a temperature of 250° C. or lower to introduce a strain without generating dynamic recrystallization, a step of producing powder by granulating the material after the plastic deformation process, and a step of producing a powder billet by compressing the powder.