Effect of Nano‐Scale Precipitates Growth on the Deformation Behavior of the Cast Coarse‐Grained Al‐Cu Alloy
Effect of Nano‐Scale Precipitates Growth on the Deformation Behavior of the Cast Coarse‐Grained Al‐Cu Alloy
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DOI：
10.1002/adem.200800150
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发表时间：
2008-12
影响因子：
3.6
通讯作者：
W. Zhao-;H. Y. Wang;J. Wang;D. Yao;H Zhao;Q. Jiang
中科院分区：
文献类型：
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作者：
W. Zhao-;H. Y. Wang;J. Wang;D. Yao;H Zhao;Q. Jiang
在较高应变速率下的变形被认为是提高纳米结构金属和合金的延展性的方法。[1]更高的应变速率产生晶体缺陷以与更高速率的动态恢复竞争，因此增加加工硬化速率，这导致纳米结构金属和合金的更高延展性。[2-4]尽管有上述报告，但仍有一些结果揭示了相互矛盾的行为。Cheng报告说，纳米结构的Cu在较低的应变速率下具有较高的延展性。[5]在高应变速率下，上述变形机制不能解释反常应变速率效应。最近，在现有的铸造粗晶（CG）Al-Cu合金中观察到类似的现象。迄今为止，关于粗晶金属和合金在较低应变速率下具有较高塑性的研究很少，尤其是铸造Al-Cu合金。因此，本研究的目的是调查的原因较高的塑性在较低的应变速率为10-4 s-1和10-3 s-1，应变速率为10-2 s-1和10-1 s-1的应变速率敏感性，在铸造铝铜合金改性纳米级PrxOy。
Deformation at higher strain rates is considered as a method of enhancing the ductility of nanostructured metals and alloys.[1] Higher strain rates generate crystalline defects to compete with dynamic recovery at a higher rate and therefore increase the work hardening rate, which leads to higher ductility of the nanostructured metals and alloys.[2–4] Despite the above reports, there are some results revealing the contradictory behavior. Cheng reported that a nanostructured Cu had higher ductility at lower strain rates.[5] The abnormal strain rates effect cannot be explained by the above deformation mechanism at higher strain rates. Recently, it is observed the similar phenomenon in the present cast coarsegrained (CG) Al-Cu alloy. So far, very little work on the higher ductility at the lower strain rates for the coarse-grained metals and alloys has been published, especially for the cast Al-Cu alloy. Therefore, the objective of this study is to investigate the reason for higher ductility at lower strain rates of 10–4 s–1 and 10–3 s–1, and strain rate sensitivity at strain rates of 10–2 s–1 and 10–1 s–1 in the cast Al-Cu alloy modified by nano-scale PrxOy.