金属材料的室温不连续屈服行为研究现状

Research Progress on Room-Temperature Discontinuous Yielding Behavior of Metal Materials

摘要:

金属材料在室温变形过程中的不连续屈服现象是影响其力学性能和应用安全性的关键科学问题。本文系统综述了近年来该领域的研究进展，重点围绕不连续屈服的特征表现、影响因素及相关机制展开讨论。不连续屈服在应力-应变曲线上主要表现为屈服下降和屈服平台的特征。研究表明，合金成分、再结晶程度、晶粒尺寸与形貌、相组成及其稳定性等微观组织特征是影响不连续屈服的主要因素，这些因素通过调控位错运动机制和变形机制来影响材料的屈服行为。此外，还探讨了不连续屈服与金属材料室温变形机制、加工硬化行为之间的内在联系。基于现有研究，指出未来研究应重点关注微观组织调控、成分优化、变形机制以及变形本构模型建立等方面，为深入理解不连续屈服现象的本质和优化材料性能提供理论基础。

Abstract:

Discontinuous yielding of metal materials during room-temperature deformation is a critical scientific issue that significantly affects their mechanical properties and application safety. This review summarized recent research advancements in this field, with a focus on the characteristics, influencing factors, and underlying mechanisms of discontinuous yielding. The discontinuous yielding phenomenon was mainly characterized by a yield drop and a stress plateau on the stress-strain curve. Results show that microstructural characteristics such as alloy composition, degree of recrystallization, grain size and morphology, as well as phase composition and stability, serve as primary factors influencing discontinuous yielding. These factors affect the yielding behavior by regulating dislocation movement and deformation mechanisms. Furthermore, the intrinsic relationship among discontinuous yielding, room-temperature deformation mechanism, and the work hardening behavior in metallic materials was explored. Based on current research, future studies should focus on the microstructure regulation, alloy design, deformation mechanisms, and the development of constitutive models to deepen the understanding of discontinuous yielding and to provide a foundation for optimizing material properties.