Effects of Co on microstructure evolution of a 4th generation nickel-based single crystal superalloys

被引：19

作者：

Pan, Qinghai ^{[1
]}

Zhao, Xinbao ^{[1
]}

Cheng, Yuan ^{[1
]}

Yue, Quanzhao ^{[1
]}

Gu, Yuefeng ^{[1
]}

Bei, Hongbin ^{[1
]}

Zhang, Ze ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Superalloys Sci & Technol, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China

来源：

INTERMETALLICS | 2023年 / 153卷

基金：

中国国家自然科学基金;

关键词：

Single crystal superalloys; Microstructural stability; gamma' phase; Coarsening rate; Cobalt; VOLUME FRACTION; COARSENING KINETICS; ALLOYING ADDITIONS; RUPTURE PROPERTIES; RE; CREEP; PRECIPITATION; DIFFUSION; STABILITY; BEHAVIOR;

D O I：

10.1016/j.intermet.2022.107798

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

For further composition optimization, the microstructure evolution of the fourth-generation nickel-based single crystal superalloys, which contains different Co (Cobalt) additions, is studied at three thermal exposure temperatures. Based on Lifshitz, Slyozov and Wagnerz (LSW) theory and trans-interface diffusion-controlled (TIDC) theory, the effects of Co content and aging temperatures on coarsening rate of gamma ' phase are investigated in detail. The results show that the diffusion coefficient of solute is accelerated, but the gamma/gamma ' interfacial energy decreases with the addition of Co, thus changing the coarsening rate. Furthermore, the thermodynamic equilibrium solubility difference of elements between gamma ' and gamma, and the segregation of elements at the gamma/gamma ' interface are alleviated with increase of Co, resulting in the suppression of TCP phase after long-time thermal exposure, which guides the economical design of nickel-based single crystal superalloys.

引用

页数：10

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