Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

被引：109

作者：

Kim, Dong Geun ^{[1
]}

Jo, Yong Hee ^{[1
]}

Yang, Junha ^{[1
]}

Choi, Won-Mi ^{[1
]}

Kim, Hyoung Seop ^{[1
]}

Lee, Byeong-Joo ^{[1
]}

Sohn, Seok Su ^{[1
,2
]}

Lee, Sunghak ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Ctr High Entropy Alloys, Pohang 37673, South Korea

[2] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea

来源：

SCRIPTA MATERIALIA | 2019年 / 171卷

基金：

新加坡国家研究基金会;

关键词：

High-entropy alloy; Phase stability; Transformation induced plasticity; Strain hardening; Cryogenic strength; TEMPERATURE-DEPENDENCE; PHASE-TRANSFORMATION; MECHANICAL-PROPERTIES; TENSILE; DEFORMATION; MN; MICROSTRUCTURE; EVOLUTION; TOUGHNESS; STEEL;

D O I：

10.1016/j.scriptamat.2019.06.026

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V10Cr10Co30Fe50 alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could bean appropriate design strategy to develop new ultrastrong alloys for cryogenic applications. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：67 / 72

页数：6

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