Enhanced strength-ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae

被引：725

作者：

Shi, Peijian ^{[1
,2
,3
]}

Ren, Weili ^{[1
,2
,3
]}

Zheng, Tianxiang ^{[1
,2
,3
]}

Ren, Zhongming ^{[1
,2
,3
]}

Hou, Xueling ^{[4
]}

Peng, Jianchao ^{[4
]}

Hu, Pengfei ^{[4
]}

Gao, Yanfei ^{[5
]}

Zhong, Yunbo ^{[1
,2
,3
]}

Liaw, Peter K. ^{[5
]}

机构：

[1] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200072, Peoples R China

[2] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200072, Peoples R China

[3] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China

[4] Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

中国国家自然科学基金;

关键词：

MECHANICAL-PROPERTIES; CARBON; DEFORMATION; DESIGN;

D O I：

10.1038/s41467-019-08460-2

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Realizing improved strength-ductility synergy in eutectic alloys acting as in situ composite materials remains a challenge in conventional eutectic systems, which is why eutectic high-entropy alloys (EHEAs), a newly-emerging multi-principal-element eutectic category, may offer wider in situ composite possibilities. Here, we use an AlCoCrFeNi2.1 EHEA to engineer an ultrafine-grained duplex microstructure that deliberately inherits its composite lamellar nature by tailored thermo-mechanical processing to achieve property combinations which are not accessible to previously-reported reinforcement methodologies. The as-prepared samples exhibit hierarchically-structural heterogeneity due to phase decomposition, and the improved mechanical response during deformation is attributed to both a two-hierarchical constraint effect and a self-generated microcrack-arresting mechanism. This work provides a pathway for strengthening eutectic alloys and widens the design toolbox for high-performance materials based upon EHEAs.

引用

页数：8

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