Microstructure and Mechanical Properties of As-Cast and Laser Powder Bed Fused AlCoCrFeNi2.1 Eutectic High-Entropy Alloy

doi:10.11900/0412.1961.2023.00301

IMR OpenIR

	Microstructure and Mechanical Properties of As-Cast and Laser Powder Bed Fused AlCoCrFeNi2.1 Eutectic High-Entropy Alloy
	Tang, Xu 1,2; Zhang, Hao 1; Xue, Peng 1; Wu, Lihui 1; Liu, Fengchao 1; Zhu, Zhengwang ; Ni, Dingrui 1; Xiao, Bolv 1; Ma, Zongyi 1
通讯作者	Zhang, Hao(haozhang@imr.ac.cn) ; Ni, Dingrui(drni@imr.ac.cn)
	2024-11-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:11 页码:144
摘要	Eutectic high-entropy alloys (EHEAs), as a typical kind of in situ composite, have become a potential alternative for conventional alloys because of their advantages in high-entropy alloys and eutectic alloys. Casting is the conventional preparation method of EHEAs, which is a well-established process with low production efficiency. Laser powder bed fusion (LPBF) is an economical and effective preparation technology that provides a novel way to directly form fine and complex EHEA components. In this study, considering the different application requirements and technical characteristics, AlCoCrFeNi2.1 EHEA was prepared by vacuum induction melting and LPBF, respectively. The effect of the preparation process on the microstructure of the alloy was investigated. In addition, tensile properties of the samples at 20, 500, and 700 degrees C were investigated. Results showed that as-cast and LPBF-formed AlCoCrFeNi2.1 exhibited a eutectic structure composed of alternating fcc and bcc/B2 phases. The high heating and cooling rates during the LPBF process were conducive to the formation of ultrafine and uniform eutectic lamellae, which significantly reduced element segregation. During tensile deformation at room temperature, considering the strong phase boundary strengthening and dual-phase synergistic deformation, the ultimate tensile strength of the LPBF-formed sample was enhanced by about 28% compared with that of the as-cast sample, and a satisfactory elongation of 10% was obtained. At 500 degrees C, the mechanical properties of the as- cast and LPBF-formed samples decreased probably because of the severe phase transformation in the alloy. When the testing temperature was increased to 700 degrees C, the mechanical properties of the as-cast sample continued to decrease. The LPBF-formed samples showed a low tensile strength and superior elongation that should be attributed to the eutectic lamellae sliding along the phase boundaries at high temperatures. Meanwhile, the fracture mechanism of the LPBF-formed sample was dominated by ductile fracture. This work could provide a theoretical basis for the optimization of the microstructure and mechanical properties of EHEAs, thereby promoting their industrial application.
关键词	eutectic high-entropy alloy laser powder bed fusion microstructure mechanical prop- erty fracture mechanism eutectic high-entropy alloy laser powder bed fusion microstructure mechanical prop- erty fracture mechanism
资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Associa- tion, CAS ; Bintech-IMR Research and Development Program
DOI	10.11900/0412.1961.2023.00301
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; Youth Innovation Promotion Associa- tion, CAS[2022191] ; Bintech-IMR Research and Development Program[GYY-JSBU-2022-010]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001376975000002
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/181477
专题	中国科学院金属研究所
通讯作者	Zhang, Hao; Ni, Dingrui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tang, Xu,Zhang, Hao,Xue, Peng,et al. Microstructure and Mechanical Properties of As-Cast and Laser Powder Bed Fused AlCoCrFeNi2.1 Eutectic High-Entropy Alloy[J]. ACTA METALLURGICA SINICA,2024,60(11):144.
APA	Tang, Xu.,Zhang, Hao.,Xue, Peng.,Wu, Lihui.,Liu, Fengchao.,...&Ma, Zongyi.(2024).Microstructure and Mechanical Properties of As-Cast and Laser Powder Bed Fused AlCoCrFeNi2.1 Eutectic High-Entropy Alloy.ACTA METALLURGICA SINICA,60(11),144.
MLA	Tang, Xu,et al."Microstructure and Mechanical Properties of As-Cast and Laser Powder Bed Fused AlCoCrFeNi2.1 Eutectic High-Entropy Alloy".ACTA METALLURGICA SINICA 60.11(2024):144.