Cryogenic deformation mechanism of CrMnFeCoNi high-entropy alloy fabricated by laser additive manufacturing process

Zengcheng Qiu; Chengwu Yao; Kai Feng; Zhuguo Li; Paul K. Chu

International Journal of Lightweight Materials and Manufacture (Mar 2018)

Cryogenic deformation mechanism of CrMnFeCoNi high-entropy alloy fabricated by laser additive manufacturing process

Zengcheng Qiu,
Chengwu Yao,
Kai Feng,
Zhuguo Li,
Paul K. Chu

Affiliations

Zengcheng Qiu: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China
Chengwu Yao: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China
Kai Feng: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China; Department of Physics, Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, Special Administrative Region; Corresponding author. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Zhuguo Li: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China; Corresponding author. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Fax: +86 21 34203024.
Paul K. Chu: Department of Physics, Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, Special Administrative Region

Journal volume & issue: Vol. 1, no. 1
pp. 33 – 39

Abstract

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Well-formed equimolar CrMnFeCoNi high-entropy alloy (HEA) bulk samples with good tensile properties are fabricated by laser additive manufacturing (LAM) processing. To elucidate the deformation mechanism, tensile tests are performed on at 77 K and 293 K and interrupted at different strains. Electron backscatter diffraction and X-ray diffraction indicate that the large initial dislocation density introduced by LAM processing increases the yield strength significantly and dislocation motion is the dominant deformation mechanism. In addition, deformation twinning is a large addition at large strain levels under cryogenic conditions. These two mechanisms and their interaction produce the excellent mechanical properties of bulk HEA. Keywords: High-entropy alloys, Laser additive manufacturing, Cryogenics, Dislocation density, Deformation twinning

Published in International Journal of Lightweight Materials and Manufacture

ISSN: 2588-8404 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology
Website: https://www.keaipublishing.com/en/journals/international-journal-of-lightweight-materials-and-manufacture/

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