Cracking behavior of newly-developed high strength eutectic high entropy alloy matrix composites manufactured by laser powder bed fusion
作者机构：Research&Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen 518057China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第163卷第32期
页 面：81-91页
核心收录：
学科分类：0820[工学-石油与天然气工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：the Guangdong Basic and Applied Basic Research Foundation(grant No.2021B1515120028) National Natural Science Foundation of China(grant Nos.52130204,52174376,51822405,and 52202070) Science and Technology Innovation Team Plan of Shann Xi Province(grant No.2021TD-17) Youth Innovation Team of Shaanxi Universities Thousands Person Plan of Jiangxi Province(grant No.JXSQ2020102131) Xi’an Science and Technology Program(grant No.21ZCZZHXJS-QCY6-0005) Fundamental Research Funds for the Central Universities(grant Nos.D5000210902 and D5000220057) Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(grant No.CX2022033)
主 题：Laser powder bed fusion Eutectic high entropy alloy Composites Defects
摘 要：A novel AlCoCrFeNi2.1 eutectic high entropy alloy(EHEA)composite doped with SiC particles was designed and fabricated by laser powder bed fusion(LPBF).Its microstructure characteristic,tensile properties,and metallurgical defects,with an emphasis on cracking behavior,have been *** results showed that the addition of SiC particles into the AlCoCrFeNi_(2.1)matrix enabled the development of a{100}texture and highly elongated columnar grains,which were the main contributors to mechanical behavior *** ultimate tensile strength of 1466±26 MPa and elongation of 9%±3%achieved in the as-deposited EHEA composite surpassed those of advanced metal alloys subjected to additive manufacturing ***,severe horizontal and longitudinal cracks,as well as a few micro-cracks were observed in the as-deposited bulk ***-cracks were verified to be associated with the aggregation of carbon and oxide *** formed in the final stage of solidification owing to insufficient liquid feeding ability and solidification *** formation of macroscopic cracking was induced by the tensile stress accumulations at sample edges,and the stress concentration areas where microcracks and pores were located were the predominant propagation *** work provides guidelines for defect control in SiC-reinforced EHEA,assisting in the high-performance design and integrated manufacturing of EHEA composite components.
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