OS2006 マグネシウム合金板の繰り返し変形における加工硬化挙動(OS20-2 マグネシウムの変形挙動,OS-20 HCP金属の実験力学と計算力学)

概要

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We conducted an in-plane cyclic loading test for an AZ31B magnesium alloy sheet with various strain amplitudes. Metallographic observation was also carried out to investigate the effect of twinning on the work-hardening behavior. The work-hardening rate in later stage of compression rose with the number of cycles, whereas two-stage work-hardenings arose during tension and the beginning of the second work-hardening became later as the cycle number increased. The metallographic observation showed that the area where the twinning was activated increased wholly as the cycle number increased because some areas did not untwin and remained in twinning orientations after tension. This result showed that the work-hardening rate in later stage of compression rose because the activity of twinning tended to saturate and at the same time the slip systems started being activated as the cycle number increased. Similarly the strain range necessary to complete untwining, i.e. the first work-hardening, would expand as the cycle number increased because the area where the twinning was activated increased, thus the beginning of the second work-hardening became later with the number of cycles.
2011-07-16