文献类型：期刊文献

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

作者：Niu, Jiacheng[1,2];Fu, Zhiqiang[1,2];Chen, Weiping[1,2];Lu, Tiwen[3];Hao, Liangyan[4];Xiong, Wei[4];Wen, Haiming[5]

机构：[1]South China Univ Technol, Guangdong Key Lab Adv Met Mat Proc, Guangzhou 510640, Peoples R China;[2]South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Met Mat, Guangzhou 510640, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]Univ Pittsburgh, Dept Mech Engn & Mat Sci, Phys Met & Mat Design Lab, Pittsburgh, PA 15261 USA;[5]Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

年份：2024

卷号：179

起止页码：9

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20234715080508);WOS:【SCI-EXPANDED(收录号:WOS:001119143200001)】；

基金：J.C. Niu and Z.Q. Fu acknowledge the financial support from the National Natural Science Foundation of China (No. 52103360), from the Pearl River Talent Program (No. 2021QN02C766), and from the Basic and Applied Basic Research Foundation of Guangdong Province (No. 2020A1515111104). W.P. Chen thanks the financial support from the Key-Area Research and Development Program of Guangdong Province (No. 2018B090905002). T.W. Lu, L.Y. Hao, W. Xiong and H.M. Wen performed this research without funding support.

语种：英文

外文关键词：Direct casting; High -entropy alloy; Hierarchical microstructure; Mechanical properties

摘要：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 Fe 27 Ni 35 Cr 18.25 Al 13.75 Co 2 Ti 2 Mo 2 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 ultrafine lamellar microstructure (ULM), ultrafine rhombus microstructure (URM), ultrafine vermicular microstructure (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.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.