ON GENERATION OF DISLOCATIONS AT MISFITTING PARTICLES IN A DUCTILE MATRIX
ON GENERATION OF DISLOCATIONS AT MISFITTING PARTICLES IN A DUCTILE MATRIX
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DOI：
10.1080/14786436908228069
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发表时间：
1969-01-01
影响因子：
1.6
通讯作者：
JOHNSON, L
中科院分区：
文献类型：
--
作者：
ASHBY, MF;JOHNSON, L
研究了形变基体中失配球形粒子界面处剪切位错环的形核问题。计算了形核位错的平衡形状和位置。有两个关键的不匹配水平。在成核发生之前，必须达到取决于颗粒尺寸的较低临界水平。在上临界水平之上，这实际上与颗粒尺寸无关，成核将总是发生。实验测量的临界失配表明，上临界水平描述的自发产生的位错在相干粒子，而较低的水平描述他们的产生在非相干粒子。可能的原因进行了讨论。
The nucleation of a shear dislocation loop from the interface of a misfitting spherical particle in a deformable matrix is considered. The equilibrium shapes and positions of the nucleated dislocation have been calculated. There are two critical levels of misfit. The lower critical level, which is dependent on the particle size, must be reached before nucleation can occur. Above the upper critical level, which is virtually independent of the particle size, nucleation will always occur. Experimental measurements of the critical misfit show that the upper critical level describes the spontaneous generation of dislocations at coherent particles, whereas the lower level describes their generation at incoherent particles. Possible reasons for this are discussed.