Secondary phases in Al CoCrFeNi high-entropy alloys: An in-situ TEM heating study and thermodynamic appraisal

被引：334
作者：
Rao, J. C. [1 ,2 ,3 ]
Diao, H. Y. [4 ]
Ocelik, V. [2 ]
Vainchtein, D. [2 ]
Zhang, C. [5 ]
Kuo, C. [4 ]
Tang, Z. [4 ]
Guo, W. [6 ]
Poplawsky, J. D. [6 ]
Zhou, Y. [1 ]
Liaw, P. K. [4 ]
De Hosson, J. Th. M. [2 ]
机构：
[1] Harbin Inst Technol, Inst Adv Ceram, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Univ Groningen, Zernike Inst Adv Mat, Dept Appl Phys, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[3] Univ Maryland, Maryland NanoCtr, College Pk, MD 20742 USA
[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[5] CompuTherm LLC, Middleton, WI 53562 USA
[6] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
来源：
ACTA MATERIALIA | 2017年 / 131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 alloy; Secondary phases; In-situ heating TEM; Atom-probe-tomography; Thermodynamic calculations; MECHANICAL-PROPERTIES; ELECTRICAL-PROPERTIES; FATIGUE BEHAVIOR; MICROSTRUCTURE; SYSTEM; DECOMPOSITION; EVOLUTION; DESIGN;
D O I：
10.1016/j.actamat.2017.03.066
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Secondary phases, either introduced by alloying or heat treatment, are commonly present in most high entropy alloys (HEAs). Understanding the formation of secondary phases at high temperatures, and their effect on mechanical properties, is a critical issue that is undertaken in the present study, using the AlxCoCrFeNi (x = 0.3, 0.5, and 0.7) as a model alloy. The in-situ transmission-electron-microscopy (TEM) heating observation, an atom-probe-tomography (APT) study for the reference starting materials (Al-0.3 and Al-0.5 alloys), and thermodynamic calculations for all three alloys, are performed to investigate (1) the aluminum effect on the secondary-phase fractions, (2) the annealing-twinning formation in the face centered-cubic (FCC) matrix, (3) the strengthening effect of the secondary ordered body-centered cubic (B2) phase, and (4) the nucleation path of the a secondary phase thoroughly. The present work will substantially optimize the alloy design of HEAs and facilitate applications of HEAs to a wide temperature range. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：206 / 220
页数：15
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