Microstructural evolution and nanoindentation creep behavior in a PdAgCuAuPtZn multi-principal elements alloy

被引:0
|
作者
Zhou, Xuan [1 ]
Ge, Hualong [1 ]
Zhang, Shunmeng [1 ]
Fu, Li [1 ,2 ]
Xia, Zhiwei [1 ]
He, Junjie [1 ]
Xiong, Kai [1 ]
Cheng, Jun [3 ]
Liu, Yi [4 ]
Ma, Lihua [4 ]
Fu, Quan [4 ]
Xiong, Zhi [4 ]
Mao, Yong [1 ]
机构
[1] Yunnan Univ, Mat Genome Inst, Sch Mat & Energy, Kunming 650091, Peoples R China
[2] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China
[3] Northwest Inst Nonferrous Met Res, Shaanxi Key Lab Biomed Met Mat, Xian 710016, Peoples R China
[4] Sino Platinum Met Co Ltd, Yunnan Precious Met Lab Co Ltd, State Key Lab Adv Technol Comprehens Utilizat Plat, Kunming 650106, Peoples R China
基金
中国国家自然科学基金;
关键词
Precious metals MPEA; Nanoindentation creep behavior; Discontinuous precipitation; Chemical short-range order; Spinodal decomposition; SHORT-RANGE ORDER; AU-CU ALLOYS; HIGH-ENTROPY; STRAIN-RATE; DEFORMATION; PHASE; MECHANISMS; CRCONI;
D O I
10.1016/j.jmrt.2024.11.001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The precious metal based multi-principal elements alloy (MPEA) PdAgCuAuPtZn is mainly used in electrical contact applications, as a new type of multi-component alloy. However, there is a lack of detailed information about the precipitation evolution and its effect on the creep properties of the PdAgCuAuPtZn alloys. Combining nanoindentation and detailed electron microscopy analyses, we investigated the microstructural evolution and creep mechanism of the Pd-30Ag-14Cu-10Au-10Pt-1Zn alloy during aging treatment systematically. Microstructural analyses show that discontinuous precipitation (DP) with Cu-rich and Ag-rich phases is observed in aging-treated samples. As the aging temperature increases, DP gradually replaces the matrix and coarsens. Meanwhile, the grain size gradually decreases because of the existence of DP. Spinodal decomposition (SD) and chemical short-range order (CSRO) can be observed in the matrix and CSRO can be observed in the Cu-rich phase. Nanoindentation results show that when the aging temperature is below 500 degrees C, the matrix and DP hardness gradually increase, from 4.06 GPa to 7.42 GPa and 3.78 GPa-5.29 GPa, respectively, and gradually decreases at temperatures higher than 500 degrees C. Based on the creep displacement analysis, the increasing temperature contributes to improving the creep resistance and DP has higher creep resistance than matrix. The results of the creep stress exponent (n) and activation volume (V) also indicate that the creep mechanism is dominated by dislocation movement. Both CSRO and SD contribute to improving creep resistance. These results will be beneficial to both deeply understanding the creep behavior of PdAgCuAuPtZn alloys and designing highperformance precious metal multi-component alloys.
引用
收藏
页码:6130 / 6143
页数:14
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