613 大圧下圧延されたAl-4.2mass%Mg合金板材の低温超塑性(オーガナイズドセッション : 超成形・超塑性と材料)

概要

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Superplasticity at relatively low temperatures around 573K has been investigated a severely rolled sheet of an Al-4.2mass%Mg alloy. It was already found that fine recrystallized grains of about 5μm was gotten by annealing for 30s at 573K in a salt bath for the severely rolled sheet, which was made from high purity ingots to reduce amount of inclusion and precipitate. The maximum elongation to failure of 208% is obtained at 563K and l.4×10^<-3>s^<-1> at a higher heating rate of 5Ks^<-1>, though the sheet has a small thickness of only 0.1mm. While the fracture surface with the smaller elongation exhibits lots of coarsely granular features, the finer features with a size less than 5μm are observed on the fracture surface with a large elongation of 189%.
一般社団法人日本機械学会の論文
2000-09-08