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Parametric dislocation dynamics simulation of precipitation hardening in a Ni-based superalloy

机译：镍基高温合金中沉淀硬化的参数位错动力学模拟

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摘要

The precipitation hardening in Ni-based superalloys, which contain up to 73% volume fraction of cubic coherent γ' precipitates in y matrix, has been investigated by three-dimensional parametric dislocation dynamics. Dislocations glide under external stress on a (111) slip plane intersected by cubic γ' precipitates. The critical resolved shear stress (CRSS), the stress to drive dislocations through precipitates, is evaluated for variations in various microstructural parameters: γ' volume fraction, antiphase boundary (APB) energy and γ channel width (i.e., precipitate/particle spacing). It is shown that the CRSS depends on the square root of the APB energy while being linearly proportional to the volume fraction of γ'. A microstructure with a non-uniform size distribution of γ' has a CRSS that is 20-30% smaller than that of a microstructure with a uniform γ' size of the same value as the average γ' size in the non-uniform microstructure. This is due to some local channel widths larger than the average channel width, and larger channel widths allow easier bending of the dislocation line. Our results indicate that the channel width plays an important role in determining the CRSS in addition to the γ' size. For channels narrower than 20 nm, the CRSS is found to increase with decreasing channel width but to depend only weakly on γ' size.
机译：通过三维参数位错动力学研究了镍基高温合金中的沉淀硬化，该合金中y基体中立方相干γ'沉淀的体积分数高达73％。位错在外力作用下在与立方γ'沉淀相交的（111）滑动面上滑动。评估了临界解析剪切应力（CRSS）（通过位错驱动位错的应力）各种微观结构参数的变化：γ'体积分数，反相边界（APB）能量和γ通道宽度（即沉淀/颗粒间距）。结果表明，CRSS取决于APB能量的平方根，而与γ'的体积分数成线性比例。具有不均匀尺寸分布的γ'的微结构的CRSS比具有均匀γ'尺寸且具有与不均匀微结构中的平均γ'尺寸相同值的微观结构的CRSS小20-30％。这是由于某些局部通道宽度大于平均通道宽度，并且较大的通道宽度使位错线更容易弯曲。我们的结果表明，除了γ'的尺寸外，通道宽度在确定CRSS方面也起着重要作用。对于窄于20 nm的通道，发现CRSS随着通道宽度的减小而增加，但仅微弱地取决于γ'的大小。

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