Application of a modified Ostwald ripening theory in coarsening of γ′ phases in Ni based single crystal superalloys

被引：65

作者：

Ai, Cheng ^{[1
]}

Zhao, Xinbao ^{[2
]}

Zhou, Jian ^{[1
]}

Zhang, Heng ^{[1
]}

Liu, Lei ^{[1
]}

Pei, Yanling ^{[1
]}

Li, Shusuo ^{[1
]}

Gong, Shengkai ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Xian Thermal Power Res Inst Co Ltd, Xian 710032, Shaanxi, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 632卷

基金：

中国博士后科学基金;

关键词：

Ni based single crystal superalloy; gamma' phase; Diffusion; Coarsening; Ostwald ripening; SOLID-SOLUTIONS; DEGREES-C; NICKEL; BEHAVIOR; INTERDIFFUSION; PRECIPITATION; DIFFUSION; KINETICS; MICROSTRUCTURES; RE;

D O I：

10.1016/j.jallcom.2015.01.215

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：

A modified Ostwald ripening theory was used to evaluate the coarsening behavior of gamma' phases in Ni based single crystal superalloys during thermal exposure. After introducing a dimensionless factor correlated with volume fraction of gamma' phase into the classical Lifshitz-Slyozov-Wagner (LSW) coarsening theory, this model was thus developed by coupling formulaic interfacial energy and diffusion coefficient (including activation energy and pre-exponential factor) as function of alloy composition. The coarsening rate coefficients and radius sizes of gamma' phases were then presented, which show good agreement with the corresponding experimental results. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：558 / 562

页数：5

共 31 条

[1] The effect of long-term thermal exposures on the microstructure and properties of CMSX-10 single crystal Ni-base superalloys [J].