Diffusional relaxation of the dislocation-inclusion repulsion
Diffusional relaxation of the dislocation-inclusion repulsion
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位错-夹杂排斥的扩散弛豫
DOI：
10.1080/01418618308236545
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
M. J. Litton
中科院分区：
文献类型：
--
作者：
D. Srolovitz;R. Petkovic;M. J. Litton
摘要 虽然先前对位错和夹杂物之间弹性相互作用的分析预测，当夹杂物的剪切模量超过基体的剪切模量时，会发生排斥，但氧化物弥散强化合金的实验观察表明，位错能够到达较硬的氧化物颗粒的表面。我们试图通过分析夹杂物附近的扩散对弹性相互作用的影响来纠正这一明显的矛盾。该问题分为两部分，具体取决于位错是否主要以剪切力或静水力对夹杂物施加载荷。我们表明，在每种情况下，位错-粒子分离随时间呈指数衰减，时间常数与剪切载荷下的夹杂物体积和夹杂物-基体界面扩散率之比成正比，并且与流体静力载荷下的夹杂物半径平方和体积扩散率之比成正比。比较不同时间所需的时间...
Abstract While previous analyses of the elastic interaction between dislocations and inclusions predict repulsion when the shear modulus of the inclusion exceeds that of the matrix, experimental observations in oxide-dispersion-strengthened alloys show that dislocations are able to reach the surface of the stiffer oxide particles. We attempt to rectify this apparent contradiction by analysing the effects of diffusion, in the vicinity of the inclusion, on the elastic interactions. The problem is divided into two parts, depending on whether the dislocation loads the inclusion predominantly in shear or hydrostatically. We show that in each case the dislocation-particle separation decays exponentially with time, the time constant being proportional to the ratio of the inclusion volume and the inclusion-matrix interfacial diffusivity for shear loading, and proportional to the ratio of the square of the inclusion radius and the bulk diffusivity for hydrostatic loading. A comparison of the time required for diff...