Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

被引：90

作者：

Fu, Zhiqiang ^{[1
,2
]}

MacDonald, Benjamin E. ^{[1
]}

Li, Zhiming ^{[3
]}

Jiang, Zhenfei ^{[2
]}

Chen, Weiping ^{[2
]}

Zhou, Yizhang ^{[1
]}

Lavernia, Enrique J. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Mat Sci & Engn, Irvine, CA 92697 USA

[2] South China Univ Technol, Guangdong Key Lab Adv Metall Mat Proc, Guangzhou 510640, Guangdong, Peoples R China

[3] Max Planck Inst Eisenforsch GmbH, Dusseldorf, Germany

来源：

MATERIALS RESEARCH LETTERS | 2018年 / 6卷 / 11期

关键词：

High entropy alloy; heterostructure; single-phase; strength; ductility; MECHANICAL-PROPERTIES; STRAIN; BEHAVIOR; DEFORMATION; DESIGN;

D O I：

10.1080/21663831.2018.1526222

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Coarse-grained (CG) single-phase face-centered cubic (fcc) high-entropy alloys (HEAs) normally show insufficient room temperature strength. Here we design and implement a heterogeneous grain structure to strengthen a single-phase fcc Fe29Ni29Co28Cu7Ti7 HEA. Significantly, the heterostructured (HS) fcc HEA shows a dramatic enhancement (increasing from approximate to 350 to approximate to 614MPa) in tensile yield strength as compared to its CG counterpart. As a result of its extraordinary work-hardening ability arising from the heterogeneous grain structure, the novel HS HEA exhibits a very high ultimate strength of approximate to 1308MPa, and a good ductility of approximate to 23.1% which is almost identical to that of its CG counterpart. [GRAPHICS] IMPACT STATEMENTIntroducing a heterogeneous grain structure to a soft fcc Fe29Ni29Co28Cu7Ti7 HEA, the heterostructured HEA shows significantly enhanced strengths at an essentially identical ductility as compared to the CG counterpart.

引用

页码：634 / 640

页数：7

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