Simultaneously enhanced strength-ductility of AlCoCrFeNi2.1 eutectic high-entropy alloy via additive manufacturing

The negative effects of thermal cycles in the process of additive manufacture present a challenge for the control of microstructure so as to fabricate the products with improved properties compared with conventional casting technique. In this work, AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) wa...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-01, Vol.830, p.142327, Article 142327
Main Authors: Huang, Liufei, Sun, Yaoning, Chen, Na, Luan, Hengwei, Le, Guomin, Liu, Xue, Ji, Yaqi, Lu, Yiping, Liaw, Peter K., Yang, Xiaoshan, Zhou, Yuzhao, Li, Jinfeng
Format: Article
Language:English
Subjects:
Cooling rate
Ductility
Eutectic alloys
Eutectic high-entropy alloy
Eutectics
High entropy alloys
Homogeneous structure
Laser deposition
Laser metal deposition
Mechanical properties
Mechanical property
Microstructure
Strain hardening
Tensile properties
Tensile strength
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Summary:The negative effects of thermal cycles in the process of additive manufacture present a challenge for the control of microstructure so as to fabricate the products with improved properties compared with conventional casting technique. In this work, AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) was prepared by laser metal deposition (LMD). Compared with conventionally cast EHEA samples, the LMD-fabricated EHEA samples showed significantly enhanced tensile strength (by 19.7%) and increased tensile ductility (by 56.4%). Such enhancement in tensile properties was attributed to the refinement of the uniformly distributed eutectic-structure, which improved the strain hardening/dislocation accumulation capability of the EHEA. The present work provides a new strategy to utilize both the high cooling rates of LMD and the eutectic-structure characteristics for forming refined homogeneous structures and thus achieving superior mechanical properties to those prepared by traditional processing techniques.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.142327