Stability of the metastable β'-Cu4Ti phase in Cu-Ti alloys: Role of the Ti content

被引：8
|
作者：
Liao, Yumin [1 ]
Guo, Chengjun [1 ]
Zhou, Chenyang [1 ]
Xie, Weibin [1 ]
Yang, Bin [1 ]
Wang, Hang [1 ]
机构：
[1] Jiangxi Univ Sci & Technol, Fac Mat Met & Chem, Ganzhou 341000, Jiangxi, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2023年 / 203卷
关键词：
Cu-Ti alloy; First principles; Metastable phase; Electrical conductivity; 1ST-PRINCIPLES CALCULATIONS; MECHANICAL-PROPERTIES; BE-CO; PRECIPITATION; MICROSTRUCTURES; BEHAVIOR;
D O I：
10.1016/j.matchar.2023.113164
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The stability of the metastable & beta;'-Cu4Ti phase is a crucial factor for the electrical conductivity of Cu-Ti alloys. Determining the factors that influence the stability of the & beta;'-Cu4Ti phase and the relationship between the & beta;'-Cu4Ti phase and the electrical conductivity of Cu-Ti alloys is a prerequisite to improve their electrical con-ductivity. In this study, the stabilities of the & beta;'-Cu4Ti and & beta;-Cu4Ti phases were investigated by first-principles calculations combined with experimental characterization. When the Ti content of the & beta;'-Cu4Ti phase is greater than or equal to 19 at.%, its stability is lower than that of the & beta;-Cu4Ti phase, resulting in instability of the & beta;'-Cu4Ti phase and dissolution of Ti atoms back into the Cu matrix. This is the main reason why it is difficult to improve the electrical conductivity of Cu-Ti alloys when the & beta;'-Cu4Ti phase is the main strengthening precipitate.
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页数：8
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