Serrated flow in nanostructured binary Mg-Al alloys

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• 作者：M. Pozuelo ; ^{pozuelo@ucla.edu" class="auth_mail" title="E-mail the corresponding author} ; ^{marta.pozuelo@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Y.W. Chang ; J. Marian ; J.M. Yang
• 关键词：Mechanical milling ; In-situ SEM micro-compression tests ; Magnesium alloys ; Portevin&ndash ; Le Chetelier effect
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：178-181
• 全文大小：521 K

文摘

Serrated flow, also known as the Portevin-Le Chatelier effect, has been extensively investigated in binary Mg-alloys such as Mg-Ag, Mg-Y and Mg-Li alloys. Interestingly, however, this effect has not been observed in Mg-Al alloys. In this work, we report the appearance of serrations in nanostructured Mg-Al alloys processed by cryomilling and spark-plasma-sintering during in-situ SEM microcompression tests at room temperature and strain rates between 2 × 10^− 3 and 10^− 1 s^− 1. The observed serrated stress-strain behavior is attributed to the dynamic strain aging by which interstitial O and/or N impurities introduced during cryomilling diffuse and interact with in-grown dislocations during deformation.