Dislocation motion in a random solid solution
Dislocation motion in a random solid solution
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随机固溶体中的位错运动
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Zaiser
中科院分区：
文献类型：
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作者：
M. Zaiser
摘要研究了位错通过随机分布的溶质原子阵列的热激活运动。研究了溶质密度的波动对位错运动激活能的影响，确定了有效激活能和激活体积的应力依赖关系。结果表明，在蠕变变形中，激活能的波动会导致蠕变应变随时间按幂规律增加，蠕变应变的指数随温度的升高而线性增加。讨论了计算的激活能谱对低频内耗的影响。
Abstract The thermally activated motion of a dislocation through an array of randomly distributed solute atoms is studied. The influence of fluctuations in the solute density on the activation energy for dislocation motion is investigated, and the stress dependences of the effective activation energy and the activation volume are determined. It is shown that, in creep deformation, fluctuations in the activation energies may lead to a creep strain which increases with time according to a power law, with an exponent that increases linearly with increasing temperature. Implications of the calculated activation energy spectrum for low-frequency internal friction are discussed.