Different Effect of Co on the Formation of Topologically Close-Packed Phases in Ni-Cr-Mo and Ni-Cr-Re Alloys

被引：0
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作者：
Qianying Shi
Ning An
Jiajie Huo
Xianfei Ding
Yunrong Zheng
Qiang Feng
机构：
[1] University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials
[2] University of Michigan,Department of Materials Science and Engineering
[3] Beijing Beiye Functional Materials Corporation,National Center for Materials Service Safety
[4] University of Science and Technology Beijing,undefined
来源：
Metallurgical and Materials Transactions A | 2017年 / 48卷
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摘要：
In current study, two sets of Ni-based alloys (Ni-Cr-Mo and Ni-Cr-Re series) containing 0 to 15 at. pct of Co addition were investigated to understand the formation behavior of TCP phases. Significant difference on the formation behavior of TCP phases and corresponding Co effect was found in two series alloys. TCP precipitates (P and µ phase) were observed in both grain interiors and boundaries in Ni-Cr-Mo series alloys. Higher levels of Co addition increased the supersaturation of Mo in the γ matrix, which explained that Co addition promoted µ phase formation. In contrast, the TCP precipitates (σ phase) formed by the manner of discontinuous precipitation transformation in the grain boundaries in Ni-Cr-Re series alloys. More Co additions suppressed the formation of σ phase, which was mainly attributed to the decreased supersaturation of Re in thermodynamically metastable γ matrix. The information obtained from simplified alloy systems in this study is helpful for the design of multicomponent Ni-based superalloys.
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页码：5639 / 5648
页数：9
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