论文标题
非速度屈服行为的晶体可塑性建模：从Ni3al单晶到基于Ni的超合金
Crystal plasticity modeling of non-Schmid yield behavior: from Ni3Al single crystals to Ni-based superalloys
论文作者
论文摘要
提出了一种晶体可塑性有限元（CPFE）框架，用于建模L12型Ni3al晶体和基于Ni的Superalloys的非schmid屈服行为。该框架依赖于直接来自方向和温度依赖性实验屈服应力数据的非SCHMID模型参数的估计。 Ni3al晶体的非弹性变形模型扩展到基于均质的脱位密度晶体可塑性框架中Ni基超合金的沉淀相。该框架用于模拟Ni3Al晶体的方向和温度依赖性产量和基于单晶Ni的超合金CMSX-4，在温度范围260-1304 K中。屈服应力的模型预测与实验一般一致。对于这两种材料，在各种温度下，在标准立体三角上，对张力压缩不对称性和屈服的主要滑动机制也进行了模型预测。这些预测提供了有关产量的基本（方向和温度依赖性）滑移机制的宝贵见解。在这方面，非SCHMID模型还可以用作独立的分析模型，用于预测屈服应力，张力压缩不对称和产量的基础滑移机制，这是方向和温度的函数。
A Crystal Plasticity Finite Element (CPFE) framework is proposed for modeling the non-Schmid yield behavior of L12 type Ni3Al crystals and Ni-based superalloys. This framework relies on the estimation of the non-Schmid model parameters directly from the orientation- and temperature-dependent experimental yield stress data. The inelastic deformation model for Ni3Al crystals is extended to the precipitate phase of Ni-based superalloys in a homogenized dislocation density based crystal plasticity framework. The framework is used to simulate the orientation- and temperature-dependent yield of Ni3Al crystals and single crystal Ni-based superalloy, CMSX-4, in the temperature range 260-1304 K. Model predictions of the yield stress are in general agreement with experiments. Model predictions are also made regarding the tension-compression asymmetry and the dominant slip mechanism at yield over the standard stereographic triangle at various temperatures for both these materials. These predictions provide valuable insights regarding the underlying (orientation- and temperature-dependent) slip mechanisms at yield. In this regard, the non-Schmid model may also serve as a standalone analytical model for predicting the yield stress, the tension-compression asymmetry and the underlying slip mechanism at yield as a function of orientation and temperature.
