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考虑镍基单晶合金细观两相共格的微组织结构特点,采用周期性胞元假设,在胞元不同区域构建其三维应力应变解析模型,并针对细观胞元中位错的增殖、攀移、切割及恢复等主要机制建立其黏塑性应变模型,二者结合较全面地模拟了镍基单晶合金SC16和DD3在1123 K和1033 K下的单调拉伸、蠕变及循环特性.根据模拟结果,对黏塑性应变模型中各个位错机制所起的作用及控制方式进行了具体分析,通过与试验曲线比较,得到了较一致的结果.
Considering the microstructure characteristics of the microscopic and two phase coherent microstructures of nickel-base single crystal alloys, the three-dimensional stress and strain analytical model was constructed in different regions of the cell using the periodic cell hypothesis. In response to the proliferation of dislocation in the mesoporous cells, Plastic deformation models were established by the principal mechanisms such as climbing, cutting and recovering. The two models combined the monotonic stretching, creep and cyclic characteristics of nickel-based single crystal alloys SC16 and DD3 at 1123 K and 1033 K. According to the simulation results, the role and control mode of each dislocation mechanism in the viscoplastic strain model are analyzed concretely. By comparing with the experimental curves, more consistent results are obtained.