Origins of high strength and ductility combination in a Guinier-Preston zone containing Mg-Al-Ca-Mn alloy
Origins of high strength and ductility combination in a Guinier-Preston zone containing Mg-Al-Ca-Mn alloy
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DOI：
10.1016/j.scriptamat.2019.01.013
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发表时间：
2019-04
影响因子：
6
通讯作者：
J. Bhattacharyya;T. Nakata;S. Kamado;S. Agnew
中科院分区：
文献类型：
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作者：
J. Bhattacharyya;T. Nakata;S. Kamado;S. Agnew
微合金化的镁铝钙锰合金在峰值时效条件下具有优异的强度和塑性组合，此前已有报道。然而，还没有报道机械论的解释。目前的工作表明，增强的应变率敏感性是导致这种行为的原因。增加的后均匀延伸率弥补了老化后均匀延伸率的下降，导致总延伸率与固溶材料相当。讨论了位错与Guinier-Preston(GP)区相互作用的热激活性质，并强调了通过微结构修改来设计应变率敏感性来优化力学性能的可能性。
The excellent strength and ductility combination of a microalloyed Mg-Al-Ca-Mn, in the peak-aged condition, has been reported previously. However, a mechanistic explanation has not been reported. The present work shows that an enhanced strain-rate sensitivity is responsible for this behavior. Increased post-uniform elongation compensates for the decrease in uniform elongation upon aging, resulting in a total elongation comparable to the solutionized material. The thermally activated nature of dislocation interactions with Guinier-Preston (GP) zones are discussed, and the potential for optimizing mechanical properties by engineering the strain-rate sensitivity through microstructural modifications is highlighted.