Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation

被引：64
|
作者：
Barr, Christopher M. [1 ]
Nathaniel, James E., II [1 ]
Unocic, Kinga A. [2 ]
Liu, Junpeng [3 ]
Zhang, Yong [3 ]
Wang, Yongqiang [4 ]
Taheri, Mitra L. [1 ]
机构：
[1] Drexel Univ, Dept Mat Sci & Engn, LeBow Hall 441,3141 Chestnut St, Philadelphia, PA 19104 USA
[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA
[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing, Peoples R China
[4] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM USA
来源：
SCRIPTA MATERIALIA | 2018年 / 156卷
基金：
美国国家科学基金会; 中国国家自然科学基金;
关键词：
High entropy alloys; Radiation induced segregation; Grain boundaries; Chemical complexity; Radiation damage; SINGLE-PHASE; TRACER DIFFUSION; DEFECT EVOLUTION; NI; BEHAVIOR; MICROCHEMISTRY; STABILITY; DEPENDENCE; CRFECONI; FEATURES;
D O I：
10.1016/j.scriptamat.2018.06.041
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High entropy alloys have gained significant interest due to several unique properties including enhanced radiation resistance. In this work, radiation induced segregation, a key phenomenon observed in alloys under irradiation, is examined for the first time at high angle grain boundaries under Ni heavy ion irradiation in the CoCrFeNiMn alloy. Our experimental study indicates significant Mn depletion and Co and Ni enrichment at grain boundaries. The segregation is discussed in the context of a proposed vacancy dominated radiation induced segregation mechanism and compared to existing models in conventional single core component alloys including stainless steels. (C) 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码：80 / 84
页数：5
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