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本文采用双模晶体相场模型,计算了双模二维相图;模拟了形变诱导六角相向正方相转变过程的多级微结构演化,详细分析了位相差、形变方向对位错、晶界、晶体结构、新相形貌的影响规律.模拟结果表明:形变方向影响正方相晶核的形核位置和生长方向,拉伸时正方相优先在变形带上形核,垂直于形变方向长大,而压缩时正方相直接在位错和晶界的能量较高处形核,平行于形变方向长大;位相差对形变诱发晶界甄没过程有显著影响,体现在能量峰上为,小位相差晶界位错的攀滑移和甄没形成一个能量峰,大位相差晶界位错攀滑移和甄没因分阶段完成而不出现明显的能量峰;形变诱导相变过程中各种因素相互作用复杂,是相变与动态再结晶的复合转变.
In this paper, the dual-mode two-phase phase diagram was calculated by using the bimodal phase field model. The multi-level microstructure evolution during the deformation-induced hexagonal to normal phase transformation was simulated. The phase difference, deformation direction, The results show that the deformation direction affects the nucleation position and growth direction of the tetragonal phase nucleus, the tetragonal phase preferentially nucleates on the deformation zone and grows perpendicularly to the deformation direction during the stretching process, While compressing, the square phase directly nucleates at the higher energy of the dislocations and the grain boundaries and grows parallel to the deformation direction. The phase difference has a significant effect on the grain boundary-induced grain boundary deformation process, which is reflected in the energy peak is small Differences in grain boundary dislocations climb climbing and screening did not form an energy peak, the large difference between the grain boundary dislocation climb slip and Zhen did not appear due to the phased completion of the obvious energy peak; deformation induced phase change during the various The complex interaction of factors is a composite transformation of phase transition and dynamic recrystallization.