Rapid hardening induced by electric pulse annealing in nanostructured pure aluminum
Rapid hardening induced by electric pulse annealing in nanostructured pure aluminum
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DOI：
10.1016/j.scriptamat.2011.10.023
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发表时间：
2012-02
影响因子：
6
通讯作者：
W. Zeng;Yao Shen;Ning Zhang;Xiaoxu Huang;Jeff Wang;G. Tang;A. Shan
中科院分区：
文献类型：
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作者：
W. Zeng;Yao Shen;Ning Zhang;Xiaoxu Huang;Jeff Wang;G. Tang;A. Shan
采用大变形冷轧法制备了纳米结构纯铝，并对其进行了电脉冲退火和传统空气炉退火的回复退火。这两种退火处理导致屈服强度的增加，由于发生的“位错源限制硬化”机制。然而，电脉冲退火材料的硬化动力学基本上更快。详细的显微组织表征表明，电脉冲退火过程中的快速硬化与位错结构的恢复率提高有关。
Nanostructured pure aluminum was fabricated by heavy cold-rolling and then subjected to recovery annealing either by applying electric pulse annealing or by traditional air furnace annealing. Both annealing treatments resulted in an increase in yield strength due to the occurrence of a “dislocation source-limited hardening” mechanism. However, the hardening kinetics was substantially faster for the electric pulse annealed material. Detailed microstructural characterization suggested that the rapid hardening during electric pulse annealing is related to an enhanced rate of recovery of dislocation structures.