Microstructure and Precipitate Evolution in Cu-3.2Ni-0.75Si Alloy Processed by Twin-Roll Strip Casting

被引：16
作者：
Cao, Guangming [1 ]
Zhang, Shuang [1 ]
Chen, Jian [1 ]
Jia, Fei [1 ]
Fang, Feng [1 ]
Li, Chenggang [1 ]
机构：
[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2021年 / 30卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Cu-3; 2Ni-0; 75Si alloy; precipitation behavior; strip casting; transformation kinetics; twin-roll strip casting; NI-SI ALLOY; PHASE-TRANSFORMATION; HIGH-CONDUCTIVITY; STRENGTH; BEHAVIOR; STEEL; DEFORMATION; CR; DIFFRACTION; KINETICS;
D O I：
10.1007/s11665-020-05371-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Given the sub-rapid solidification characteristics of twin-roll strip casting (TRSC), the solidification structure and growth process of precipitates during aging treatment were studied. The results showed that TRSC could refine the solidification structure and inhibit the microsegregation of Cu-3.2Ni-0.75Si alloy. During aging treatment, the precipitates mainly consisted of rod beta-Ni3Si and disk delta-Ni2Si. The precipitate size was increased by increasing the aging time, which altered the mechanism of precipitation strengthening. Also, the experimental results indicated that precipitate strengthening arises either from the cutover mechanism or from the Orowan mechanism. Furthermore, the Avrami equation, which describes the kinetics of phase transformation and electrical conductivity during aging were established for the Cu-Ni-Si alloy, and the calculated results are consistent with the data. The Cu-3.2Ni-0.75Si alloy after aging treatment at 450 degrees C for 4 h exhibited optimum performance, and the tensile strength and electrical conductivity were as high as 711 MPa and 43.2% IACS, respectively.
引用
收藏
页码：1318 / 1329
页数：12
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