Workability, heat treatment characteristics and mechanical properties of Mg-Li-Al and Mg-Li-Zn ternary alloys.
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Aluminum or zinc was added by 10 mass% to Mg-20, 25 and 30 mass%Li alloys to develop a material with high specific strength and good cold-workability. Influences of aluminum and zinc on their cold-workability, heat treatment characteristics and tensile properties were investigated. The addition of zinc improves cold-workability and ductility and, therefore, even a Mg-20 mass%Li system alloy is able to be rolled to a rolling reduction of 90% without cracks. Aluminum- or zinc-added alloys harden by the quenching from temperature higher than 150°C. Particularly, aluminum-added alloys have a large increment of hardness by quenching from temperature over 300°C. The hardening may be concluded to be caused by an increase of amount of aluminum solubility in lithium solid solution, because results of X-ray diffraction analysis show that the height of diffraction peaks of AlLi and Al4Li9 compounds is lowered and a lattice parameter of lithium solid solution decreases by the quenching. Aluminum-added alloys quenched from a temperature of 300°C, therefore, have higher tensile strength than the as-rolled specimens. Furthermore, a Mg-20 mass%Li-10 mass%Al alloy shows an age hardening at room temperature probably due to the spinodal decomposition.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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