High strength and high toughness metal and method of producing the same
a high-toughness, metal technology, applied in the field of high-toughness metal, can solve the problems of alloys having a conventional strength and toughness that are insufficient for practical use, and no alloys having enough strength and toughness for putting in practical use, etc., to achieve high strength, high toughness, and high strength
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embodiment 1
[0199]A magnesium alloy according to Embodiment 1 of the present invention is a ternary or more alloy essentially containing Mg, Zn and rare-earth element, in which the rare-earth element is one or more elements selected from the group consisting of Y, Dy, Ho and Er.
[0200]A composition range of the Mg—Zn—Y alloy according to the embodiment is shown in FIG. 8 at a range bounded by a line of A-B-C-D-E. When a content of Zn is set to “a” atomic % and a content of one or more of the rare-earth elements is set to “b” atomic %, “a” and “b” satisfy the following expressions (1) to (3):
0.5≦a≦5.0; (1)
1.0≦b≦5.0; and (2)
0.5a≦b. (3)
[0201]When a content of Zn exceeds 5 atomic %, a toughness (or a ductility) tends to be decreased particularly. And, when a total content of Y exceeds 5 atomic %, a toughness (or a ductility) tends to be decreased particularly.
[0202]When a content of Zn is less than 0.5 atomic % or a content of Y is less than 1.0 atomic %, at least either one of strength or toughn...
embodiment 2
[0213]A magnesium alloy according to Embodiment 2 of the present invention is a quaternary alloy or more alloy essentially containing Mg, Zn and rare-earth element, in which the rare-earth element is one or more elements selected from the group consisting of Y, Dy, Ho and Er and the forth element is one or two or more elements selected from the group consisting of Yb, Sm and Nd.
[0214]The magnesium alloy in the embodiment has the following composition range. When a content of Zn is set to “a” atomic %, a content of Y is set to “b” atomic % and a total content of one or two or more forth elements is set to “c” atomic %, “a”, “b” and “c” satisfy the following expressions (1) to (5):
0.5≦a≦5.0; (1)
1.0≦b≦5.0; (2)
0.5≦a≦b; (3)
0≦c≦3.0; and (4)
1.05≦b+c≦6.0. (5)
[0215]Causes for setting a content of Zn to 5 atomic % or less, setting a content of Y to 5 atomic % or less, setting a content of Zn to 0.5 atomic % or more and setting a content of Y to 1.0 atomic % or more are the same as the Em...
embodiment 3
[0220]A magnesium alloy according to Embodiment 3 of the present invention is a quaternary alloy or more alloy essentially containing Mg, Zn and rare-earth element, in which the rare-earth element is one or more elements selected from the group consisting of Y, Dy, Ho and Er and the forth element is one or two or more elements selected from the group consisting of La, Ce, Pr, Eu and Mm. Mm (misch metal) is a mixture or an alloy of multiple rare-earth elements consisting of Ce and La mainly, and is a residue generated by refining and removing useful rare-earth element, such as Sm and Nd, from mineral ore. Its composition depends on a composition of the mineral ore before the refining.
[0221]The magnesium alloy according to the embodiment has the following composition. When a content of Zn is set to “a” atomic %, a content of Y is set to “b” atomic % and a total content of one or two or more forth element is set to “c” atomic %, “a”, “b” and “c” satisfy the following expressions (1) to...
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Abstract
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