Hardening by annealing and softening by deformation in nanostructured metals

Science
Xiaoxu HuangNobuhiro Tsuji

Abstract

We observe that a nanostructured metal can be hardened by annealing and softened when subsequently deformed, which is in contrast to the typical behavior of a metal. Microstructural investigation points to an effect of the structural scale on fundamental mechanisms of dislocation-dislocation and dislocation-interface reactions, such that heat treatment reduces the generation and interaction of dislocations, leading to an increase in strength and a reduction in ductility. A subsequent deformation step may restore the dislocation structure and facilitate the yielding process when the metal is stressed. As a consequence, the strength decreases and the ductility increases. These observations suggest that for materials such as the nanostructured aluminum studied here, deformation should be used as an optimizing procedure instead of annealing.

References

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Citations

Apr 18, 2013·Nature Communications·Shijian ZhengNathan A Mara
May 7, 2014·Proceedings of the National Academy of Sciences of the United States of America·XiaoLei WuYuntian T Zhu
Nov 11, 2015·Proceedings of the National Academy of Sciences of the United States of America·Xiaolei WuYuntian Zhu
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Feb 26, 2020·Nature·Xiaoling ZhouBin Chen
Apr 1, 2021·Nano Letters·Qingzhong MaoYonghao Zhao
Oct 6, 2021·Chemical Communications : Chem Comm·Bingzhao WuXuzhou Yan

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