位错密度演化模型的研究进展

Research progress of dislocation density evolution models

作为材料微观结构状态的一个内部变量,位错密度与材料组织结构演化和力学性能密切相关。金属材料在塑性变形过程中,其位错密度会发生演化。因此,位错密度演化模型的建立是材料组织结构和力学性能研究领域的一个重要课题。本文简要介绍了位错密度的演化规律及其物理机制,综述了当前位错密度演化模型的研究进展,总结了位错密度演化数值计算方法的研究现状,介绍了位错密度对组织结构演化和力学性能的影响规律,探讨了位错密度演化研究的发展趋势。

As an internal variable of microstructure,dislocation density is closely related to microstructure evolution and mechanical properties.During the process of plastic deformation of metal materials,the dislocation density will evolve.Therefore,the establishment of dislocation density evolution model is an important topic in the field of microstructure and mechanical properties of materials.In this review paper,the evolution of dislocation density and its physical mechanism are briefly introduced.The research progress of dislocation density evolution model is reviewed.The research status of numerical calculation method of dislocation density evolution is summarized.The influence law of dislocation density on mechanical properties is explained.Finally,the development trend of dislocation density evolution research is discussed in detail.