Effect of heat treatment on adiabatic shear susceptibility in ZK60 magnesium alloy

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• 作者：Yang Yang^a ; ^b ; ^c ; Lihong Jiang^a ; ^{jianglily1027@sina.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Adiabatic shear susceptibility ; Adiabatic shear bands ; Heat treatment ; ZK60 magnesium alloy
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：10 May 2016
• 年：2016
• 卷：664
• 期：Complete
• 页码：146-154
• 全文大小：3577 K

文摘

Adiabatic shear susceptibility was investigated in the ZK60 magnesium alloy by means of the radial collapse of a thick-walled cylinder. The adiabatic shear susceptibility of ZK60 magnesium alloy samples with different heat treated conditions were evaluated in light of their self-organization characteristics of adiabatic shear bands, such as shear- band spacing, shear- band average length, shear- band average propagated velocity. It is shown that the shear- band spacing in the (as-quenched) sample was 5.2 mm with the effective strain of 0.72 and 4.72 mm with the effective strain of 0.95, one order of magnitude more than that of the peak-aged sample, with shear- band spacing of 0.49 mm (ε_ef=0.72${\mathrm{\epsilon }}_{\mathrm{ef}}=0.72$) and 0.38 mm (ε_ef=0.95)${\mathrm{\epsilon }}_{\mathrm{ef}}=0.95)$, respectively. Calculations indicated that the average velocity of shear band propagates nearly 2.5 times faster in the peak-aged sample (271 m/s) than in that of the (as-quenched )sample (105 m/s). Experimental results show that the peak-aged sample has higher adiabatic shear susceptibility, due to precipitates and the higher strength of the peak-aged samples.