Dual heterogeneous structure facilitating an excellent strength-ductility combination in an additively manufactured multi-principal-element alloy

被引：45

作者：

Huang, Jing ^{[1
,2
]}

Li, Wanpeng ^{[2
]}

He, Junyang ^{[1
]}

Zhou, Rui ^{[2
]}

Chou, Tzu-Hsiu ^{[2
]}

Yang, Tao ^{[2
]}

Liu, Chain-Tsuan ^{[2
]}

Zhang, Weidong ^{[3
]}

Liu, Yong ^{[1
]}

Huang, Jacob C. ^{[2
]}

机构：

[1] Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China

[2] City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China

[3] Hunan Univ, Coll Mat Sci & Engn, Changsha, Peoples R China

来源：

MATERIALS RESEARCH LETTERS | 2022年 / 10卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Additive manufacturing; multi-principal-element alloy; dual heterogeneous microstructure; mechanical properties; hetero-deformation induced hardening; HIGH-ENTROPY ALLOY; MECHANICAL-PROPERTIES; PRECIPITATION BEHAVIOR; BACK STRESS; MICROSTRUCTURE; ULTRASTRONG; ORIGIN; STEEL; DISLOCATION;

D O I：

10.1080/21663831.2022.2067790

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The (FeCoNi)(86)Ti7Al7 multi-principal-element alloy with a dual heterogeneous microstructure was successfully fabricated by selective laser melting, exhibiting an excellent combination of strength (ultimate tensile strength, 1085.2 +/- 23.2 MPa) and ductility (30.5 +/- 2.6%). It is evidenced that the joint effects of the hetero-deformation induced hardening from grains with heterogeneous geometrically necessary dislocations densities, in-situ formed B2 phase, and the coherent precipitation hardening from in-situ formed nano L1(2) phase were responsible for the strength. This work sheds light on the feasibility of simplifying the production of multi-mechanism strengthened alloys within one step and paves a new avenue to produce high-performance complex-shaped components. IMPACT STATEMENT (FeCoNi)(86)Ti7Al7 multi-principal-element alloy exhibiting heterogeneity on the grains structure and in-situ precipitation was successfully fabricated by selective laser melting. It shows both good tensile strength and ductility.

引用

页码：575 / 584

页数：10

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