Effect of strain rate on elongation and serration behavior in Al-Mg alloy sheets.

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  • Ａｌ―Ｍｇ系合金薄板の伸びおよびセレーションに及ぼす歪速度の影響
  • Al Mgケイ ゴウキン ウスイタ ノ ノビ オヨビ セレーション ニ オヨボ

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Abstract

Effect of strain rate and Mg content on elongation and serration behavior was studied in pure aluminum and Al–Mg alloy sheets with Mg content up to 6.5%. Elongation increased monotonously with strain rate in pure aluminum, but Mg–containing alloys showed a minimum elongation at a strain rate of about 1 s−1. The elongation decrease with strain rate in a strain rate range below the minimum was much sharper and the elongation increase in a range above the minimum was less abrupt in alloys with Mg content of 4~6% than in alloys with Mg content of 2~3%. Consequently, although the alloys with high Mg content showed higher elongation in ordinary static tensile testing, the alloys with low Mg content exhibited higher elongation in dynamic condition which was considered closer to press forming of automobile body panels. Serration amplitude in load-displacement curves decreased with increasing strain rate and decreasing Mg content. The low-Mg alloys exhibited no serration in dynamic condition at a strain rate of about 1 s−1, while the high-Mg alloys still showed serration to a certain extent. The observed phenomena were discussed based on dynamic strain aging, dynamic recovery, and temperature rise during the testing by adiabatic deformation.

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