On the strain rate dependence of the critical strain for plastic instabilities in Al-Mg alloys
On the strain rate dependence of the critical strain for plastic instabilities in Al-Mg alloys
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DOI：
10.1016/j.scriptamat.2016.11.037
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发表时间：
2017-03
影响因子：
6
通讯作者：
N. Chibane;H. Ait-Amokhtar;C. Fressengeas
中科院分区：
文献类型：
--
作者：
N. Chibane;H. Ait-Amokhtar;C. Fressengeas
在 Portevin-Le Chatelier 效应的动态应变时效解释中分析了 Al-Mg 合金中塑性不稳定性的应变/应变率范围。分析重点关注锯齿开始临界应变最小值周围发生的几种现象与应用应变率曲线。对该临界点附近的流变应力应变率敏感性的应变率依赖性的分析可以解释稳定区域向逆行为范围内的更大应变的扩展以及当镁含量增加时临界点向更大应变率的转变。
The strain/strain rate range of plastic instability in Al-Mg alloys is analyzed within the dynamic strain aging interpretations of the Portevin-Le Chatelier effect. The analysis focuses on several phenomena occurring around the minimum of the critical strain for the onset of serrations vs. applied strain rate curve. The analysis of the strain rate dependence of the flow stress strain rate sensitivity in the neighborhood of this critical point allows explaining the extension of the stability region to larger strains in the inverse behavior range and the shift to larger strain rates of the critical point when the Mg content increases.