Hierarchical microstructure enables high strength and good ductility in as-cast Fe27Ni35Cr18.25Al13.75Co2Ti2Mo2 high-entropy alloy

Jiacheng Niu ¹Zhiqiang Fu ¹Weiping Chen ¹Tiwen Lu ²Liangyan Hao ³Wei Xiong ³Haiming Wen⁴

扫码查看

作者信息

1. Guangdong Key Laboratory for Advanced Metallic Materials Processing,South China University of Technology,Guangzhou 510640,China;National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China
2. Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China
3. Physical Metallurgy and Materials Design Laboratory,Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,PA,15261,United States of America
4. Department of Materials Science and Engineering,Missouri University of Science and Technology,Rolla,Missouri 65409,United States of America
折叠

Abstract

As-cast alloys often require complex thermomechanical processing to obtain a hierarchical structure to achieve a good combination of strength and ductility.Here in this work,a novel hierarchical Fe27Ni35Cr18.25Al13.75Co2Ti2Mo2 high-entropy alloy(HEA)with ultra-high tensile strength and excellent ductility was fabricated by direct casting.The as-cast alloy exhibits hierarchical structure with an ul-trafine lamellar microstructure(ULM),ultrafine rhombus microstructure(URM),ultrafine vermicular mi-crostructure(UVM),nanosized precipitates and spinodal decomposition(SP)that develops during casting and cooling.The incompatibility of face-centered cubic(FCC)and body-centered cubic(BCC)phases in the deformation process leads to heterogeneous deformation-induced(HDI)hardening,which brings the alloy a tensile yield strength(YS)of～1056 MPa,an ultimate tensile strength(UTS)of～1526 MPa and a total elongation(El)of～15.6％.Additionally,the numerous interfaces generated by the hierarchical structure absorb the energy during deformation,effectively retarding the dislocation motion and causing strong work-hardening.

Key words

Direct casting/High-entropy alloy/Hierarchical microstructure/Mechanical properties

引用本文复制引用

基金项目

National Natural Science Foundation of China(52103360)

from the Pearl River Talent Program(2021QN02C766)

Basic and Applied Basic Research Foundation of Guangdong Province(2020A1515111104)

Key-Area Research and Development Program of Guangdong Province(2018B090905002)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

参考文献量46

段落导航