Ultrafine-grained CoCrFeMnNi high-entropy alloy produced by cryogenic multi-pass caliber rolling

被引：53

作者：

Won, Jong Woo ^{[1
]}

Lee, Sangwon ^{[1
]}

Park, Sang Hyeop ^{[1
]}

Kang, Minju ^{[1
]}

Lim, Ka Ram ^{[1
]}

Park, Chan Hee ^{[1
]}

Na, Young Sang ^{[1
]}

机构：

[1] Korea Inst Mat Sci, Met Mat Div, Chang Won 51508, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 742卷

基金：

新加坡国家研究基金会;

关键词：

High-entropy alloy; Cryogenic deformation; Twinning; Ultrafine grained microstructure; Mechanical properties; Transmission electron microscopy; SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; MECHANICAL-PROPERTIES; TWIP STEEL; MICROSTRUCTURE EVOLUTION; REFINEMENT; TEMPERATURES; CRMNFECONI; RESISTANCE; STRESS;

D O I：

10.1016/j.jallcom.2018.01.313

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The ultrafine-grained (UFG) structure (similar to 100 nm) of CoCrFeMnNi high-entropy alloy was achieved using cryogenic multi-pass caliber rolling at 77 K to impose less deformation (epsilon = 1) compared to severe plastic deformation (SPD, epsilon > 4). Highly increased twinning activity at 77 K caused the grain interiors to fragment significantly, so UFG structure could be induced without imposing SPD. Intersected twin morphology and secondary twins played a key role in twinning-induced grain refinement to achieve UFG structure. The processed material showed an exceptional high yield strength of similar to 1.5 GPa with a reasonable fracture elongation of similar to 10% at room temperature. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：290 / 295

页数：6

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