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摘要:
NiCo-based superalloys exhibit higher strength and creep resistance over conventional superalloys. Compositional effects on elastic properties of theγ andγ' phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random structures. The lattice constant, bulk modulus, and elastic constants vary linearly with the Co concentration in the NiCo solution. In the selected (Ni, Co)3(Al, W) and (Ni, Co)3(Al, Ti) modelγ' phase, the lattice constant, and bulk modulus show a linear trend with alloying element concentrations. The addition of Co, Ti, and W can regulate lattice mismatch and increase the bulk modulus, simultaneously. W-addition shows excellent performance in strengthening the elastic properties in theγ' phase. Systems become unstable with higher W and Ni contents, e.g., (Ni0.75Co0.25)3(Al0.25 W0.75), and become brittle with higher W and Co addition, e.g., Co3(Al0.25 W0.75). Furthermore, Co, Ti, and W can increase the elastic constants on the whole, and such high elastic constants always corre-spond to a high elastic modulus. The anisotropy index always corresponds to the nature of Young's modulus in a specific direction.
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篇名 Composition effect on elastic properties of model NiCo-based superalloys
来源期刊 中国物理B(英文版) 学科
关键词 NiCo-based superalloys elastic constants special quasi-random structures (SQS) directional Young's modulus
年,卷(期) 2020,(2) 所属期刊栏目
研究方向 页码范围 429-438
页数 10页 分类号
字数 语种 英文
DOI 10.1088/1674-1056/ab6204
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NiCo-based superalloys
elastic constants
special quasi-random structures (SQS)
directional Young's modulus
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中国物理B(英文版)
月刊
1674-1056
11-5639/O4
北京市中关村中国科学院物理研究所内
eng
出版文献量(篇)
17050
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0
总被引数(次)
27962
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