Elastic and plastic anisotropy after straining of nanocrystalline palladium
Elastic and plastic anisotropy after straining of nanocrystalline palladium
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纳米晶钯应变后的弹塑性各向异性
DOI：
10.1103/physrevb.85.085407
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发表时间：
2012
影响因子：
3.7
通讯作者：
P. Gumbsch
中科院分区：
文献类型：
--
作者：
D. V. Bachurin;P. Gumbsch
在室温下，以s的恒定应变速率，对三维纳米钯沿着不同加载路径的单轴应变进行了原子模拟。结果表明，在一定的变形后，试样的弹性和塑性行为都表现出明显的各向异性。令人惊讶的是，杨氏模量可以显著地随着样品的变形历史而变化。其中一些变化是可逆的。它们可以松弛，也可以通过施加相反的变形来移除。提出了一种基于晶界过剩自由体积迁移的机制来解释这种行为。
Atomistic simulations of uniaxial straining of three-dimensional nanocrystalline palladium along different loading paths were performed at room temperature and at a constant strain rate ofs. It is found that both the elastic behavior and plastic behavior of the specimen display a pronounced anisotropy after some deformation. Surprisingly, the Young's modulus can significantly change with the deformation history of the sample. Some of these changes are found to be reversible. They either relax or can be removed by applying the opposite deformation. A mechanism based on excess-free-volume migration in the grain boundaries is proposed to explain such behavior.