Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

被引：60

作者：

Wang, Jianying ^{[1
]}

Zou, Jianpeng ^{[1
]}

Yang, Hailin ^{[1
]}

Dong, Xixi ^{[2
]}

Cao, Peng ^{[3
]}

Liao, Xiaozhou ^{[4
]}

Liu, Zhilin ^{[5
]}

Ji, Shouxun ^{[2
]}

机构：

[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Brunel Univ London, Brunel Ctr Adv Solidificat Technol BCAST, Uxbridge UB8 3PH, Middx, England

[3] Univ Auckland, Dept Chem & Mat Engn, Auckland 1142, New Zealand

[4] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia

[5] Cent South Univ, Coll Mech & Elect Engn, Light Alloy Res Inst, Changsha 410083, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 135卷

基金：

中国国家自然科学基金; 英国工程与自然科学研究理事会;

关键词：

Medium-entropy alloys; Mechanical properties; Heterogeneous structure; gamma' nanoprecipitates; Crystalline defects; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; STRENGTH; PRECIPITATION; STEEL; SYNERGY;

D O I：

10.1016/j.jmst.2022.06.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coarsening-grained single-phase face-centered cubic (fcc) medium-entropy alloys (MEAs) normally exhibit insufficient strength for some engineering applications. Here, superior mechanical properties with ultimate tensile strength of 1.6 GPa and fracture strain of 13.1% at ambient temperature have been achieved in a (CoCrNi)(94)Ti3Al3 MEA by carefully architecting the multi-scale heterogeneous structures. Electron microscopy characterization indicates that the superior mechanical properties mainly originated from the favorable heterogeneous fcc matrix (1-40 mu m) and the coherent spherical gamma' precipitates (10100 nm), together with a high number density of crystalline defects (2-10 nm), including dislocations, small stacking faults, Lomer-Cottrell locks, and ultrafine deformation twins. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：241 / 249

页数：9

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