Elastic strain energy control of the precipitate free zone around primary carbides in nickel base alloy 725

被引：18
作者：
Song, M. [1 ]
Wen, J. -F. [2 ,3 ]
Jiao, Z. [1 ]
Was, G. S. [1 ]
机构：
[1] Univ Michigan, Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
[2] East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China
[3] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA
来源：
ACTA MATERIALIA | 2016年 / 120卷
基金：
中国博士后科学基金;
关键词：
Alloy; 725; Microstructure; Precipitate free zones (PFZs); Stress; Finite element (FE); ZN-MG ALLOY; ELLIPSOIDAL INCLUSION; MECHANICAL-PROPERTIES; GRAIN-BOUNDARIES; UNIAXIAL-STRESS; SUPERALLOY; CRYSTALS; FRACTURE; DEFORMATION; MORPHOLOGY;
D O I：
10.1016/j.actamat.2016.08.038
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Precipitate free zones (PFZs) are commonly believed to be controlled by either vacancy or solute depletion around sinks. This study shows that the PFZ around primary carbides (Nb, Ti)C is also influenced by stress field in alloy 725, which is a nickel base alloy hardened by gamma" precipitates. Finite element simulation suggests that the interaction energy between the local stress induced by primary carbides and the transformation strain of gamma" cause a bias in their nucleation. These observations show that in addition to diffusion, internal stress can significantly influence the nucleation of precipitates around sinks. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：138 / 149
页数：12
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