文献类型：期刊文献

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

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

机构：[1]Key Laboratory of Impact and Safety Engineering of Ministry of Education of China,Ningbo University,Ningbo 315211,China;[2]Leibniz Institute for Solid State and Materials Research Dresden,Institute for Complex Materials,Helmholtzstr.20,01069 Dresden,Germany;[3]Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;[4]Department of Mechanical and Industrial Engineering,Tallinn University of Technology,19086 Tallinn,Estonia;[5]Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,A-8700 Leoben,Austria;[6]CBCMT,Vellore Institute of Technology,Vellore 632014,Tamil Nadu,India;[7]Department of Mechanical and Aerospace Engineering,University of Central Florida,Orlando,FL 32816-2450,United States

年份：2023

期号：5

起止页码：245

中文期刊名：Journal of Materials Science & Technology

外文期刊名：材料科学技术（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2023_2024】；PubMed;

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

语种：英文

中文关键词：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-offcan 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.