文献类型：期刊文献

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

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

年份：2016

卷号：120

起止页码：138

外文期刊名：ACTA MATERIALIA

收录：;EI(收录号：20163502754521);WOS:【SCI-EXPANDED(收录号:WOS:000385327200015)】；

基金：M.S and G.S.W acknowledge the financial support by EPRI (contracts 10002164 and 10002154) and DOE (contract 4000136101). J.F.W acknowledges China Postdoctoral Science Foundation (Contract 2015M581543). M.S. also thanks Dr. Wenjun Kuang for assistant with EBSD experiments. Access to the microscopes of the Electron Microscopy Analysis Laboratory (EMAL) at University of Michigan is also acknowledged.

语种：英文

外文关键词：Alloy 725; Microstructure; Precipitate free zones (PFZs); Stress; Finite element (FE)

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.