Shunsuke Taniguchi1, Rumi Kitazawa1,2,3, Yoshihisa Tanaka4, Makoto Yoshida5 and Susumu Horibe1
1Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo 169-0072
For magnesium alloy ZK60 with different heat treatments, controlled plastic strain amplitude fatigue tests were conducted. Effects of twinning and aging treatments on fatigue process were investigated by analyzing the second derivative of hysteresis half-loop. It is found that during compression the convex peak appears at the strain where twinning begins. It is also found that during tension the convex peak appears at the strain where detwinning begins and the concave peak appears at the strain where slip begins to be predominant. Analyzing the strain at the convex peak in compression at the plastic strain amplitude of 6 × 10-3, for solution treated material and over-aged material twinning hardens with increasing cycle. On the other hand, for T6 material twinning softens from 5 cycle to Nf/5 cycle and then hardens from Nf/5 cycle to Nf/2 cycle. It was suggested that residual twins cause twinning hardening. It was also suggested that cut and dissolution of rod-like precipitates should cause twinning softening. Due to different states of precipitates of materials, the twinning softening appeared for only T6 material at the plastic strain amplitude of 6 × 10-3. Moreover, the softening were not found for T6 material under the plastic strain amplitude of 4 × 10-3. [doi:10.2320/jinstmet.J2013013]
magnesium alloy, fatigue test, twinning, aging treatment, hysteresis loop
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