Cu-1.0Cr-0.2Zr合金的时效析出研究
Study on Microstructure and Properties of Aging Cu-1.0Cr-0.2Zr Alloy
温盛发1, 周海涛1, 刘克明1,2, 刘志超1
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作者单位：1. 中南大学 材料科学与工程学院, 湖南 长沙 410083; 2. 江西省科学院 应用物理研究所, 江西 南昌 330029
中文关键字：Cu-Cr-Zr合金； 形变热处理； 显微组织； 性能
英文关键字：Cu-Cr-Zr alloy; mechanical heat treatment; microstructure; properties
中文摘要：研究了形变热处理及时效对Cu-1.0Cr-0.2Zr合金组织和性能的影响。结果表明：合金在960 ℃固溶2 h ，经60%冷变形再在450 ℃时效4 h的综合性能最佳，合金的抗拉强度和伸长率分别为527.4 MPa和12.3%，电导率为82.1%IACS。合金的综合性能最佳归结于在基体上析出了两种细小且弥散分布的第二相，第一种相为铬相并以六边形和球状两种形态存在，第二种相为CrCu2Zr相，且这些弥散分布的第二相减缓了回复及随后的再结晶过程。析出相的逐渐析出，导致基体贫化并减弱了基体对电子散射的作用，使电导率恢复到较高的水平。
英文摘要：The effects of thermo-mechanical heat treatment and aging on microstructure and properties of Cu-1.0Cr-0.2Zr alloy were studied. The results show that the best performance of Cu-1.0Cr-0.2Zr alloy can be obtained under the solution treatment at 960 ℃ for 2 h, then 60% cold rolling and aging at 450 ℃ for 4 h, which has the tensile strength of 527.4 MPa, elongation of 12.3% and electrical conductivity of 82.1%IACS. This is because there are two kinds of second phases in the matrix; one is chromium phases, namely which are hexagonal shape and spherical shape, and the other is CrCu2Zr phase, the finer precipitates are dispersed in the matrix and retard the recovery and recrystallization. With the finer precipitates, the electrical conductivity usually increases greatly as a result of less number of transforming electron scattered.