热力学
固溶体
微观结构
相图
熵(时间箭头)
焓
灰烬
旋节分解
作者
Jiancun Rao,Haoyan Diao,Vaclav Ocelik,D. Vainchtein,Chuan Zhang,Chih-Hsiang Kuo,Z. Tang,Wei Guo,Jonathan D. Poplawsky,Y. Zhou,Peter K. Liaw,J.Th.M. De Hosson
出处
期刊:Acta Materialia
[Elsevier]
日期:2017-06-01
卷期号:131 (131): 206-220
被引量:183
标识
DOI:10.1016/j.actamat.2017.03.066
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 (Al0.3 and Al0.5 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 σ secondary phase thoroughly. The present work will substantially optimize the alloy design of HEAs and facilitate applications of HEAs to a wide temperature range.
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