Microstructure and properties of a novel Cu-Cr-Yb alloy with high strength, high electrical conductivity and good softening resistance
Microstructure and properties of a novel Cu-Cr-Yb alloy with high strength, high electrical conductivity and good softening resistance
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DOI：
10.1016/j.msea.2020.140001
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发表时间：
2020-09-23
期刊：
影响因子：
6.4
通讯作者：
Zhao, Fenyan
中科院分区：
文献类型：
--
作者：
Ma, Muzhi;Li, Zhou;Zhao, Fenyan
设计了一种新型的Cu-Cr-Yb合金，并采用形变热处理工艺进行了制备。研究了其微观结构、力学性能和电学性能。结果表明，Cu-Cr-Yb合金比Cu-Cr合金具有更高的强度、更好的抗软化性能和更高的电导率。在80%冷轧之后，接着在500 ° C下时效，峰值时效的Cu-Cr-Yb合金分别具有160 +/-lHV的维氏硬度、465 MPa的拉伸强度、21.1%的伸长率和89.5%IACS的电导率。Cu-Cr-Yb合金经500 ℃长时间时效后，纳米级富Cr沉淀相几乎没有粗化，且具有面心立方结构。热力学分析表明，富Cr沉淀更倾向于面心立方结构的形核，Yb的加入阻碍了富Cr沉淀的形核。
A novel Cu-Cr-Yb alloy was designed and processed by thermo-mechanical treatment. The microstructure, mechanical and electrical properties were investigated in detail. The results showed that the Cu-Cr-Yb alloy had a higher strength, a better softening resistance and a considerably high electrical conductivity than the Cu-Cr alloy. After 80% cold rolling followed by aging at 500 degrees C, the peak-aged Cu-Cr-Yb alloy had a Vickers hardness of 160 +/- 1 HV, a tensile strength of 465 MPa, an elongation of 21.1% and an electrical conductivity of 89.5 %IACS, respectively. After a long-time aging at 500 degrees C, the nano-scale Cr-rich precipitates with FCC structure in the Cu-Cr-Yb alloy hardly coarsened. Thermodynamics analysis showed that the Cr-rich precipitates were inclined to nucleate with FCC structure, and the addition of Yb hindered the nucleation of the Cr-rich precipitates.