Deformation twins in nanocrystalline Al
Deformation twins in nanocrystalline Al
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DOI：
10.1063/1.1633975
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发表时间：
2003-12-15
影响因子：
4
通讯作者：
Zhu, YT
中科院分区：
文献类型：
--
作者：
Liao, XZ;Zhou, F;Zhu, YT
由于其较高的堆垛层错能，没有变形孪晶中观察到的粗晶粒铝。最近的分子动力学（MD）模拟预测的变形孪晶的形成在纳米晶（NC）铝。在这里，我们报告的透射电子显微镜观察两种类型的孪晶在数控铝低温球磨处理。它们是通过MD模拟提出的机制形成的。我们还观察到弯曲的孪晶界造成的部分位错。这些结果表明，粗晶铝所不具备的变形机制在纳米晶铝中是活跃的，它们可能是纳米晶铝某些独特力学性能的原因。(C)2003年，美国物理学会。
Due to its high stacking fault energy, no deformation twin has ever been observed in coarse-grained Al. Recent molecular dynamic (MD) simulations predicted the formation of deformation twins in nanocrystalline (nc) Al. Here, we report transmission-electron-microscopic observations of two types of twins in nc Al processed by cryogenic ball milling. They were formed via mechanisms suggested by the MD simulations. We also observed curved twin boundaries caused by partial dislocations. These results indicate that deformation mechanisms not accessible to coarse-grained Al are active in nc Al. They could be responsible for some unique mechanical properties of nc materials. (C) 2003 American Institute of Physics.