Temperature effects on the mobility of pyramidal < c + a > dislocations in magnesium

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• 作者：Haidong Fan^a ; Qingyuan Wang^a ; ^b ; ^{wangqy@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaobao Tian^a ; ^{xbtian@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jaafar A. El-Awady^c
• 关键词：Magnesium ; Pyramidal slip ; Molecular dynamics ; Temperature effects ; Dislocation mobility
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：68-71
• 全文大小：800 K

文摘

Temperature effects on the mobility of < c + a > dislocations on pyramidal planes are characterized by molecular dynamics simulations. On the first-order pyramidal planes, near-edge dislocations always decompose, while the critical resolved shear stress (CRSS) for near-screw dislocations increases with increasing temperatures. On the second-order pyramidal planes, the CRSS decreases to a minimum at ~ 400 K, then increases with temperatures. This indicates that first-order pyramidal slip is favorable at low temperatures, while at elevated temperatures both pyramidal slip planes are active, leading to profuse plasticity.