拉伸延性模型
(1. 西安交通大学 材料科学与工程学院
金属材料强度国家重点实验室，西安 710049；
2. 西安理工大学 材料科学与工程学院，西安 710048；
3. 中南大学 粉末冶金国家重点 实验室，长沙 410083)
摘 要: 基于合金中不同尺度第二相在其断裂过程中的作用机制及位错理论，建立了高强铝合金中结晶相、沉淀相以及析出强化相性质与其拉伸延性间的多元非线性关系模型。结果表明对于2024铝合金的拉伸延性，该模型的预测值与相应的实验值吻合良好。同时借助于该模型的理论分析，可以得到在确保高强铝合金强度不降低的前提下提高其延性的优化方案。
关键字: 铝合金；多级第二相；拉伸延性；模型
strength Al alloys containing second
particles of various sized scales
（1. State Key Laboratory for Mechanical Behavior of Materials,
School of Materials Science and Engineering,
Xi′an Jiaotong University, Xi′an 710049, China;
2. School of Materials Science and Engineering,
Xi′an University of Technology, Xi′an 710048, China;
3. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract:A model was established for high strength aluminum alloys to present a nonlinear relation between the tensile ductility of the alloys with the characteristics of constituents, dispersoids, and precipitates within the alloys, bas ed on both the roles of three second-particles with various sized scales in the failure and the dislocation mechanism. The results show that the ductility to fracture obtained experimentally is well agreed with that predicted by the model for an aged 2024 aluminum alloy. Moreover, an optimum could be approached to promote the ductility, as well as maintain the strength of the alloys by means of comprehensive analyses to the model.
Key words: aluminum alloys；second phase particles of various sizes；tensile ductility；model
