Microstructure and properties of Cu–Cr–Mg and Cu–Cr–Mg–Si alloys treated by multi-stage thermo-mechanical treatment
Microstructure and properties of Cu–Cr–Mg and Cu–Cr–Mg–Si alloys treated by multi-stage thermo-mechanical treatment
复制标题
DOI：
10.1016/j.msea.2023.145746
复制
发表时间：
2023-09
期刊：
影响因子：
--
通讯作者：
Linhan Li;Yufang Zhang;Muzhi Ma;Yanlin Jia;Zhu Xiao;Jinhui Hu;Zhao Xin;Xinfeng Jiang;Xianfeng Liao;Xiang Yu
中科院分区：
文献类型：
--
作者：
Linhan Li;Yufang Zhang;Muzhi Ma;Yanlin Jia;Zhu Xiao;Jinhui Hu;Zhao Xin;Xinfeng Jiang;Xianfeng Liao;Xiang Yu
Cu-0.45Cr-0.15Mg和Cu-0.45Cr-0.15Mg-0.02Si（wt.%）合金经多级形变热处理后，具有优异的综合性能，实现了高强高导的结合，硬度分别为171 HV和179 HV，电导率分别为78.8%IACS和79.9%IACS，抗拉强度分别为555 MPa和600 MPa，伸长率分别为5.6%和6.7%。在时效的不同阶段观察到三种形式的析出物：咖啡豆状、莫尔条纹和棒状析出物，并且在Cu-0.45 Cr-0.15 Mg-0.02 Si合金中有更多的析出物，这说明Si的添加促进了Cr的析出并细化了析出物，保持了高的位错密度，实现了上级强度和导电性。强度和电导率的计算表明，沉淀和位错对屈服强度的提高起着重要的作用，溶解原子是电阻的主要来源。
Cu-0.45Cr-0.15 Mg and Cu-0.45Cr-0.15Mg-0.02Si (wt.%) alloys exhibit excellent comprehensive properties after treated by multi-stage thermo-mechanical treatment, achieving the combination of high strengths and high conductivity, with hardness of 171 HV and 179 HV, electrical conductivity of 78.8 %IACS and 79.9 %IACS, tensile strengths of 555 MPa and 600 MPa and elongation of 5.6% and 6.7%, respectively. There were three forms of precipitation observed in the different stages of aging: coffee-beans, Moiré fringes, and rod-like precipitates, and more precipitation in Cu-0.45Cr-0.15Mg-0.02Si alloy, which illustrates the addition of Si promotes the precipitation of Cr and refines precipitation, preserving high density of dislocation, achieving superior strength and conductivity. The calculation of strength and conductivity indicates that precipitation and dislocations play a significant role in the increase of yield strength and dissolved atoms are the main source of resistance.