Ｍｇ‐２．０～４．５％Ａｌ‐０．７～１．５％Ｚｎ合金の高温変形特性と成形性
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Mg-Al-Zn alloys containing 2.0-4.5%Al and 0.7-1.5% Zn were cast and subsequently hot-rolled, and then the rolled sheets having a thickness of 0.83 mm were prepared. After that, they were annealed at 498 K and 623 K for 1 h. The deformation characteristics and formabilities of as-rolled (F) and annealed sheets are investigated in terms of metallography. In tensile test at 498 K fine recrystallized grains enhance grain boundary sliding, which contributes to deformation in direction of sheet thickness, in specimens with higher Al and Zn contents, resulting in isotropic deformation behavior. Deep drawing tests at 498 K reveals that the deep drawability is improved with increasing Al and Zn contents up to Al content of 3% because more dynamic recrystallized grains are generated during forming. As a result, limiting drawing ratio (LDR) of Mg-3%Al-1%Zn reaches 3.2. Excessive Al and Zn contents generate numerous fine recrystallized grains, which give rise to significant grain boundary sliding, resulting in large reduction in thickness. Therefore, LDR of Mg-4.5%Al-1.5%Zn decrease to 2.8. However, this LDR is much higher than those of aluminum alloys and steel, indicating enough formability can be obtained even in the high strength magnesium alloy. The F-specimens containing large residual working strain exhibit higher formability than the annealed specimens as a result of dynamic recrystallization during forming. Also in the stretch forming utilizing hemispherical punch with the diameter of 40 mm, the F-specimens show excellent stretch formability. That is, limiting dome height of the alloys containing Al more than 3% reaches 15 mm.
- 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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