Grain growth and dislocation density evolution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion
Grain growth and dislocation density evolution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion
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DOI：
10.1016/j.scriptamat.2010.10.027
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发表时间：
2011-02
影响因子：
6
通讯作者：
S. Ni;Yanbo Wang;Xiaozhou Liao;S. Alhajeri;Hongqi Li;Yonghao Zhao;E. Lavernia;S. Ringer;
中科院分区：
文献类型：
--
作者：
S. Ni;Yanbo Wang;Xiaozhou Liao;S. Alhajeri;Hongqi Li;Yonghao Zhao;E. Lavernia;S. Ringer;
研究了高压扭转诱导下纳米晶Ni-Fe合金的组织演变过程。高温高温诱导的晶粒生长通过晶粒旋转和聚结形成三维小角度亚晶界。进一步的变形消除了亚晶界，使位错在不同的{111}平面上滑动。大量的位错聚集在一起形成洛默-科特雷尔锁，有效地增加了纳米晶体材料的位错存储能力。这些观察结果可能有助于开发坚固和延展性的纳米晶体材料。
The structural evolution of a nanocrystalline Ni–Fe alloy induced by high-pressure torsion (HPT) was investigated. HPT-induced grain growth occurred via grain rotation and coalescence, forming three-dimensional small-angle sub-grain boundaries. Further deformation eliminates the sub-grain boundaries from which dislocations glide away on different {111} planes. A significant number of these dislocations come together to form Lomer–Cottrell locks that effectively increase the dislocation storage capacity of the nanocrystalline material. These observations may help with developing strong and ductile nanocrystalline materials.