Simultaneously healing cracks and strengthening additively manufactured Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy alloy by utilizing Fe-based metallic glasses as a glue
作者机构：School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXian 710072China School of MechanicalElectrical&Information EngineeringShandong UniversityWeihai 264209China Institute of MaterialsShanghai UniversityShanghai 200444China Herbert Gleiter Institute of NanoscienceSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXian 710072China Centre for Advanced Materials and ManufacturingSchool of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen 518057China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2024年第179卷第12期
页 面：125-137页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：National Natural Science Foundation of China(Nos.51971180,51871132,51971179 and 52271037) New R&D Institution Construction Program of Guangdong Province,China(No.2019B090905009) Shenzhen Fundamental Research Program,China(No.JCYJ20210324122203010) Shaanxi Provincial Science and Technology Program,China(No.2023-JC-ZD-23) Foreign Senior Talents Program of Guangdong Province,China and the Fundamental Research Funds for the Central Universities of China(No.D5000230131)
主 题：Selective laser melting High-entropy alloys Crack healing Metallic glasses Mechanical properties
摘 要：Solidification cracking issues during additive manufacturing(AM)severely prevent the rapid development and broad application of this *** this work,a representative Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy al-loy(HEA)susceptible to crack formation was fabricated by selective laser melting(SLM).As expected,many macroscopic cracks *** crack issues were successfully solved after introducing a certain amount of Fe-based metallic glass(MG)powder as a glue during *** effect of MG addition on the formation and distribution of defects in the SLM-processed HEA was quantitatively *** an increasing mass fraction of the MG,the dominant defects transformed from cracks to lack of fusion(LOF)defects and finally ***,the MG preferred to be segregated to the boundaries of the molten ***,the coarse columnar crystals gradually transformed into equiaxed crystals in the molten pool and fine-equiaxed crystals at the edge of the molten pool,inhibiting the initiation of cracks and providing extra grain boundary ***,multiple precipitates are formed at the boundaries of cellular structures,which contribute significantly to *** to the brit-tle SLM-processed Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) HEA,the SLM-processed HEA composite exhibited a high ultimate tensile strength greater than 1.4 Ga and enhanced *** work demonstrates that adding Fe-based MG powders as glues into SLM-processed HEAs may be an attractive method to heal cracks and simultaneously enhance the mechanical properties of additively manufactured products.
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