Cu及Cu-Zn合金压缩行为机理的研究  

Study on Mechanism of Compression Behavior of Cu and Cu-Zn Alloys

作　　者：梁晓光[1] 伞星源[1] 杨鹏[1] 程莲萍[1] 朱心昆[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2011年第4期23-28,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(50874056)

摘　　要：通过Cu及Cu-Zn合金的压缩实验,分析了不同层错能Cu及Cu-Zn合金的压缩真应力-真应变曲线,提出把Cu及Cu-Zn合金加工硬化行为以0.1的应变量为界点分为两个不同的阶段.0.1应变量之前的材料强化机理很复杂,主要受孪生、固溶强化、有序强化、位错胞等的综合影响,使得Cu、Cu-10%Zn、Cu-20%Zn和Cu-30%Zn的强度在0.1应变量前依次递减.当应变量超过0.1,材料的强化机制主要包括细晶强化与变形孪晶强化,随着层错能的降低材料的强塑性提高.本实验详细研究了Cu及Cu-Zn合金加工硬化行为及微结构演变机理,为更好地了解超细晶材料的机械变形行为以及提高材料强塑性提供参考.The true stress true strain curves of Cu and Cu-Zn alloys of different stacking fault energy are analyzed in this paper. Based on the compression tests it is proposed that the work hardening behavior of Cu and Cu-Zn alloys should be divided two distinct stages by defining a true train of 0. 1 as the dividing point. The mechanism of materials is very complicated below the true strain of 0.1. The strength of Cu, Cu-10% Zn, Cu-20% Zn and Cu-30% Zn decrease with increasing strain, which is especially affected by twinning, solid solution strengthening, ordering strengthening and dislocation cells. Over the true strain of 0. 1, the mechanism of materials mainly includes fine grain strengthening and the strengthening of deformation twins. The strength and ductility of materials increase with decreasing stacking fault energy. This paper systematically studies the work hardening behavior and the mechanism of mierostruetural evolution of Cu and Cu-Zn alloys, providing a significant guidance for understanding the mechanical behavior and achieving high strength and ductility of UFG alloys.

关 键 词：Cu及Cu-Zn合金 层错能 固溶强化 有序强化 细晶强化 变形孪晶 

分 类 号：TG146.1[一般工业技术—材料科学与工程]