高力アルミニウム合金7475の超塑性変形挙動
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概要
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7475 aluminum alloy sheet with a grain size of about 10 μm showed a large elongation of 780% when deformed at 516°C with the strain rate (ε) of 2×10<SUP>-4</SUP> sec<SUP>-1</SUP>. The plastic deformation behavior was greatly affected by grain size (<I>d</I>), deformation temperature and strain rate, and was represented by εα<I>d<SUP>-n</SUP></I> where <I>n</I>=1.8-2.5 at 516°C. Moreover, an activation energy for the deformation was found to be 84 kJ/mol, which is about a half of that of creep deformation. The superplastic deformation can be explained by a diffusion accomodated grain boundary sliding model.
- 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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