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On the core structure of 1/2{112} edge dislocations in y-TiAl

机译：y-TiAl中1/2 {112}边缘位错的核心结构

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摘要

Weak-beam image simulations have been carried out using the CUFOUR programme of a 1/2〈112〉 edge dislocation in y-Ti-50wt percent Al, dissociated into three 1/6〈112] partial dislocations bounding superlattice intrinsic stacking-fault (SISF) and superlattice extrinsic stacking-fault (SESF) ribbons of equal width. The simulations included one of the two core configurations of the composite Shockley partial dislocation found by Kumar et al. to explain their observed image contrast, and two others that involve dissociation into stair-rods. These latter simulated images cannot be distinguished from those for the model proposed by Kumar et al. for the composite Shockley dislocation and therefore account for the observed image contrast equally well. The claim of these workers that configurations consisting of stair-rod dislocations can be ruled out is not substantiated. The core structures involving sessile stair-rod dislocations explain the locked nature of the edge dislocation. The values found by Kumar et al. for the true separation between the pairs of partial dislocations have been used to calculate (on anisotropic elasticity theory) the SISF and SESF energies to be 123 + - 10mJm~(-2).
机译：使用CUFOUR程序对y-Ti-50wt％Al中的1/2 <112>边缘位错进行了弱束图像模拟，将其解离为三个1/6 <112]的部分位错，这些部分位错以超晶格本征堆垛层错（ SISF）和等宽的超晶格外在堆垛层错（SESF）色带。模拟包括Kumar等人发现的复合肖克利局部位错的两个核心构型之一。解释观察到的图像对比度，以及另外两个涉及解离成楼梯杆的图像。后面这些模拟图像与Kumar等人提出的模型无法区分开。对于复合肖克利脱位，因此可以很好地说明观察到的图像对比度。这些工人声称可以排除由楼梯错位构成的构型的主张没有得到证实。涉及无柄楼梯位错的核心结构解释了边缘位错的锁定性质。 Kumar等人找到的值。对于部分位错对之间的真正分离，已使用（根据各向异性弹性理论）计算出SISF和SESF能量为123 +-10mJm〜（-2）。

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