1. Simultaneously enhanced strength-ductility of AlCoCrFeNi2.1 eutectic high-entropy alloy via additive manufacturing.
- Author
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Huang, Liufei, Sun, Yaoning, Chen, Na, Luan, Hengwei, Le, Guomin, Liu, Xue, Ji, Yaqi, Lu, Yiping, Liaw, Peter K., Yang, Xiaoshan, Zhou, Yuzhao, and Li, Jinfeng
- Subjects
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STRAIN hardening , *MANUFACTURING processes , *LASER deposition , *THERMOCYCLING , *TENSILE strength , *EUTECTIC alloys - Abstract
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, AlCoCrFeNi 2.1 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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