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采用双模晶体相场模型,计算了二维正方相相图,并以正方相为研究对象,在原子尺度上,模拟了小角度非对称倾侧晶界结构及变形过程。结果表明,小角度非对称倾侧晶界由刃型位错和刃型位错组构成;在外加应力作用下,位错先于位错组滑移并进行短程的攀移,最后合并,位错组分离为滑移方向相反的2个刃型位错并最终与其它晶界位错组分离出的异号刃型位错合并,完成晶粒的合并。
A two-dimensional square phase diagram was calculated by using the bimodal phase field model. The square phase was taken as the research object. At the atomic scale, the small-angle asymmetric tilting grain boundary structure and deformation process were simulated. The results show that the small-angle asymmetric tilted grain boundary is composed of edge-type dislocation and edge-type dislocation group. Under the applied stress, the dislocations precede the slip of the dislocation group and carry out the short-range climbing. Finally, the dislocation The groups are separated into two edge-type dislocations with opposite slip directions and finally merged with the odd-numbered edge dislocations separated by other grain boundary dislocation groups to complete the grain combination.