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Cu-Cr-Zr-Si 双级时效析出相形成机制及 性能研究
Study on the Formation Mechanism and Properties of Cu-Cr-Zr-Si Two-stage Aging Precipitates
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- DOI:
- 作者:
- 麦 业 1，彭 博 1，陶美悦 1，田 果 1，姜 岩 1，蒋 娜 1，接金川 1，2，李廷举 1，
MAI Ye1,PENG Bo1,TAO Meiyue1,TIAN Guo1,JIANG Yan1,JIANG Na1, JIE Jinchuan1,2,LI Tingju1,2
- 作者单位:
- 1. 大连理工大学 材料科学与工程学院，辽宁 大连 116000；2. 大连理工大学宁波研究院，浙江 宁波 315000
1. College of Materials Science and Engineering, Dalian University of Technology, Dalian 116000,China; 2. Ningbo Research Institute of Dalian University of Technology, Ningbo 315000,China
- 关键词:
- Cu-Cr-Zr 合金；双级时效；微观组织；力学性能
Cu-Cr-Zr alloy; two-stage aging; microstructure; mechanical properties
- 摘要:
- 通过真空熔炼制备 Cu-0.8Cr-0.12Zr-0.05Si 铸锭，并对其进行了双级时效处理，研究不同预时效时间对富Cr 析 出相 形 貌 和 合金 力学 性能 的 影响 ， 分析 不 同 预 时 效下 样 品 的微 观 组织 演 变 及 性能 随 二 次 时 效 时间 的变 化 。结 果 表 明 ，轧 制 50%+500 ℃预 时 效 15 min+ 轧 制 80%+450 ℃时 效 2h 条 件 下的 样 品 综合 性 能 最 好 ，硬 度 、屈服 强度 、抗 拉 强度和伸长率分别为 201.7 HV、582.7 MPa、613.3 MPa 和 14.2%，电导率为 78.1%IACS。 与传统单级时效处理的 Cu-0.8Cr-0.12Zr-0.05Si 合金相比，其峰时效时间缩短了 2h，且电导率提高了 2.1%IACS。 预时效 15 min 的样品析出相主要为球状面心立方 Cr 相，而预时效 60 min 的样品析出相为球状和咖啡豆状体心立方 Cr 相。 屈服强度贡献计算表明，析出强化是双级时效下 Cu-0.8Cr-0.12Zr-0.05Si 合金的主要强化机制。Cu-0.8Cr-0.12Zr-0.05Si ingots were prepared by vacuum melting and subjected to a two-stage aging treatment. The effects of different preaging times on the morphology of the Cr-rich precipitates and the mechanical properties of the alloy were studied. The microstructure evolution and properties of the samples under different preaging times were analysed. The results show that the sample with 50% rolling + 500 ℃ preaged for 15 min + 80% rolling + 450 ℃ aged for 2h has the best comprehensive performance. The hardness, yield strength, tensile strength and elongation are 201.7 HV, 582.7 MPa, 613.3 MPa and 14.2% , respectively, and the conductivity is 78.1% IACS . Compared with the traditional single-stage aging treatment of Cu-0.8Cr-0.12Zr-0.05Si alloy, the peak aging time is shortened by 2 h, and the conductivity is increased by 2.1%IACS. The precipitated phases of the sample preaged for 15 min are mainly spherical face-centered cubic Cr phase, whereas the precipitated phases of the sample preaged for 60 min are spherical and coffee bean-like body-centered cubic Cr phase. The calculation of the yield strength contribution reveals that precipitation strengthening is the main strengthening mechanism of the Cu-0.8Cr-0.12Zr-0.05Si alloy under two-stage aging.