High-temperature deformation mechanisms in a BCC+B2 refractory complex concentrated alloy

被引：50

作者：

Couzinie, Jean-Philippe ^{[1
,2
]}

Heczko, Milan ^{[1
]}

Mazanova, Veronika ^{[1
]}

Senkov, Oleg N. ^{[3
]}

Ghazisaeidi, Maryam ^{[1
]}

Banerjee, Rajarshi ^{[4
]}

Mills, Michael J. ^{[1
]}

机构：

[1] Ohio State Univ, Ctr Electron Microscopy & Anal, Dept Mat Sci & Engn, 1305 Kinnear Rd, Columbus, OH 43212 USA

[2] Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, F-94320 Thiais, France

[3] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[4] Univ North Texas, Dept Mat Sci & Engn, Denton, TX 76207 USA

来源：

ACTA MATERIALIA | 2022年 / 233卷

关键词：

Refractory alloys; Deformation mechanisms; High temperature; Dislocations; Ordering; HIGH-ENTROPY ALLOYS; SHORT-RANGE ORDER; SCREW DISLOCATIONS; PRECIPITATION; ALUMINUM; MICROSTRUCTURE; SEGREGATION; BOUNDARIES; BEHAVIOR; TENSILE;

D O I：

10.1016/j.actamat.2022.117995

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The current study reports the analysis of the deformation mechanisms at 600 degrees C in a two-phase, BCC + B2, refractory complex concentrated alloy (RCCA) Al0.5NbTa0.8Ti1.5V0.2Zr. At this temperature, the alloy microstructure is unstable and dynamic coarsening of B2 precipitates is evidenced during the mechanical testing. After true plastic strain of 0.030 at strain rate of 10(-4) s(-1), the deformation becomes highly localized in wavy bands reflecting the profusion of cross-slip. Scanning transmission electron microscopy (STEM) observations highlight the presence of paired a/2 < 111 > dislocations that shear the B2 precipitates in a cooperative process. In addition, some chemical segregation effect is observed along the narrow dislocation bands likely induced to decrease the antiphase boundary (APB) energy of the system. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：13

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