文献类型：期刊文献

英文题名：Hierarchical microstructures and strengthening mechanisms of nano-TiC reinforced CoCrFeMnNi high-entropy alloy composites prepared by laser powder bed fusion

作者：Chen, Hongyu[1];Kosiba, Konrad[2];Lu, Tiwen[3];Yao, Ning[3];Liu, Yang[1];Wang, Yonggang[1];Prashanth, Konda Gokuldoss[4,5,6];Suryanarayana, Challapalli[7]

机构：[1]Ningbo Univ, Key Lab Impact Safety Engn, Minist Educ China, Ningbo 315211, Peoples R China;[2]Leibniz Inst Solid State & Mat Res Dresden, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden, Germany;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]Tallinn Univ Technol, Dept Mech & Ind Engn, EE-19086 Tallinn, Estonia;[5]Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria;[6]Vellore Inst Technol, CBCMT, Vellore 632014, Tamil Nadu, India;[7]Univ Cent Florida, Dept Mech & Aerosp Engn, Orlando, FL 32816 USA

年份：2023

卷号：136

起止页码：245

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20223712704089);WOS:【SCI-EXPANDED(收录号:WOS:000854079500002)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 11972202 , 51905279) .

语种：英文

外文关键词：Additive manufacturing; Laser powder bed fusion; High entropy alloy; Microstructure; Mechanical property

摘要：High entropy alloys (HEAs) have recently received extensive attention due to their appealing mechani-cal performance given their simple phase formation. This study utilized laser powder bed fusion (LPBF) to fabricate high-performance HEA components. By processing respective powder blends, LPBF enabled the fabrication of stronger composites with a uniformly distributed reinforcing phase. Here, the impact of varying content of nano-scale TiC (1-3 wt%) particles for strengthening the CoCrFeMnNi HEA was ex-plored. The microstructural features and mechanical properties of the HEA composites were investigated in detail. The introduction of nano-scale TiC into the HEA matrix encouraged the development of cross -scale hierarchical microstructure and eliminated the formation of oxide inclusions. Incorporating more nano-TiC led to a higher dislocation density and more refined microstructure in the HEA composites, whereas it posed little influence on the anisotropy of the HEA matrix which typically featured a ( 001 ) texture along the building direction. With an optimized content of nano-TiC (1-2 wt%), the strength -ductility trade-off can be overcome by exploiting multiple strengthening mechanisms encompassing grain boundary strengthening, solid solution strengthening, Orowan strengthening, and dislocation strengthen-ing. The HEA composites showed a favored strength-ductility combination with a yield strength of 748- 882 MPa, ultimate tensile strength of 931-1081 MPa, and fracture elongation of 23%-29%. This study demonstrates that the introduction of nano-scale TiC is an effective way to simultaneously improve the strength and ductility of additively manufactured HEA materials. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.