Phase separation and its effect on atomic interactions in CoCrNiCux medium-entropy alloys

被引：15

作者：

Jodi, Dennis Edgard ^{[1
]}

Park, Nokeun ^{[1
,2
]}

机构：

[1] Yeungnam Univ, Sch Mat Sci & Engn, 280 Daehak Ro, Gyeongbuk 38541, South Korea

[2] Yeungnam Univ, Inst Mat Technol, 280 Daehak Ro, Gyeongbuk 38541, South Korea

来源：

MATERIALS LETTERS | 2019年 / 255卷

基金：

新加坡国家研究基金会;

关键词：

Metals and alloys; Medium-entropy alloys; Microstructure; Phase separation; Modelling; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1016/j.matlet.2019.126528

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, the phase separation phenomenon and its effect on the atomic interactions of CoCrNiCux (x = 0, 0.33, 0.66, 1 in molar ratio) medium-entropy alloys were investigated. Phase alteration from single solid-solution face-centered cubic (FCC) phase to Cu-lean FCC1 and Cu-rich FCC2 structures was observed when Cu was added. This occurred due to the positive mixing enthalpy of Cu with other constituents, causing higher Gibbs free energy of mixing with increasing Cu content. This phase separation also affected the atomic interactions in the CoCrNiCux, as demonstrated by an atomic size misfit modelling. The tendency of the atomic interactions was also reflected in the mechanical properties, as displayed by Vickers microhardness result. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：4

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