Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy

Po Ting Lin; Hung Chi Liu; Po Ying Hsieh; Cheng Yu Wei; Che Wei Tsai; Yutaka S. Sato; Shih Che Chen; Hung Wei Yen; Nian Hu Lu; Chih Hsuan Chen

doi:10.1016/j.matdes.2020.109238

Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy

Po Ting Lin, Hung Chi Liu, Po Ying Hsieh, Cheng Yu Wei, Che Wei Tsai, Yutaka S. Sato, Shih Che Chen, Hung Wei Yen, Nian Hu Lu, Chih Hsuan Chen

ENG - Materials Processing

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

To apply high-entropy alloys (HEAs) for extensive advanced structural uses, their welding properties should be well understood. In this study, Al_0.3CoCrCu_0.3FeNi HEA was butt welded by friction stir welding (FSW). The fine-grained partially recrystallized microstructure in the stir zone gave rise to a high tensile yield strength of 920 MPa with an elongation of 37%. By microstructural observation, the excellent mechanical properties of the stir zone material were attributed to the partially recrystallized heterogeneous structure, with which the synergetic strengthening improved the strength of the HEA with considerably less trade-off in its ductility. This unique phenomenon was unprecedented in any other friction-stir welded conventional alloys and was credited to the low stacking-fault energy and the high grain growth activation energy of the HEA. This work suggests that FSW can not only produce good HEA welds but serve as a special processing technique to enhance mechanical properties of HEAs.

Original language	English
Article number	109238
Journal	Materials and Design
Volume	197
DOIs	https://doi.org/10.1016/j.matdes.2020.109238
Publication status	Published - 2021 Jan 1

Keywords

Friction stir welding
Heterogeneous structure
High-entropy alloys
Mechanical properties
Recrystallization

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matdes.2020.109238

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title = "Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy",

abstract = "To apply high-entropy alloys (HEAs) for extensive advanced structural uses, their welding properties should be well understood. In this study, Al0.3CoCrCu0.3FeNi HEA was butt welded by friction stir welding (FSW). The fine-grained partially recrystallized microstructure in the stir zone gave rise to a high tensile yield strength of 920 MPa with an elongation of 37%. By microstructural observation, the excellent mechanical properties of the stir zone material were attributed to the partially recrystallized heterogeneous structure, with which the synergetic strengthening improved the strength of the HEA with considerably less trade-off in its ductility. This unique phenomenon was unprecedented in any other friction-stir welded conventional alloys and was credited to the low stacking-fault energy and the high grain growth activation energy of the HEA. This work suggests that FSW can not only produce good HEA welds but serve as a special processing technique to enhance mechanical properties of HEAs.",

keywords = "Friction stir welding, Heterogeneous structure, High-entropy alloys, Mechanical properties, Recrystallization",

author = "Lin, {Po Ting} and Liu, {Hung Chi} and Hsieh, {Po Ying} and Wei, {Cheng Yu} and Tsai, {Che Wei} and Sato, {Yutaka S.} and Chen, {Shih Che} and Yen, {Hung Wei} and Lu, {Nian Hu} and Chen, {Chih Hsuan}",

note = "Funding Information: This work was financially supported by the “ High Entropy Materials Center ” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from the Project MOST 109-2634-F-007-024 by Ministry of Science and Technology (MOST) in Taiwan. Publisher Copyright: {\textcopyright} 2020 The Authors",

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doi = "10.1016/j.matdes.2020.109238",

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T1 - Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy

AU - Lin, Po Ting

AU - Liu, Hung Chi

AU - Hsieh, Po Ying

AU - Wei, Cheng Yu

AU - Tsai, Che Wei

AU - Sato, Yutaka S.

AU - Chen, Shih Che

AU - Yen, Hung Wei

AU - Lu, Nian Hu

AU - Chen, Chih Hsuan

N1 - Funding Information: This work was financially supported by the “ High Entropy Materials Center ” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from the Project MOST 109-2634-F-007-024 by Ministry of Science and Technology (MOST) in Taiwan. Publisher Copyright: © 2020 The Authors

PY - 2021/1/1

Y1 - 2021/1/1

N2 - To apply high-entropy alloys (HEAs) for extensive advanced structural uses, their welding properties should be well understood. In this study, Al0.3CoCrCu0.3FeNi HEA was butt welded by friction stir welding (FSW). The fine-grained partially recrystallized microstructure in the stir zone gave rise to a high tensile yield strength of 920 MPa with an elongation of 37%. By microstructural observation, the excellent mechanical properties of the stir zone material were attributed to the partially recrystallized heterogeneous structure, with which the synergetic strengthening improved the strength of the HEA with considerably less trade-off in its ductility. This unique phenomenon was unprecedented in any other friction-stir welded conventional alloys and was credited to the low stacking-fault energy and the high grain growth activation energy of the HEA. This work suggests that FSW can not only produce good HEA welds but serve as a special processing technique to enhance mechanical properties of HEAs.

AB - To apply high-entropy alloys (HEAs) for extensive advanced structural uses, their welding properties should be well understood. In this study, Al0.3CoCrCu0.3FeNi HEA was butt welded by friction stir welding (FSW). The fine-grained partially recrystallized microstructure in the stir zone gave rise to a high tensile yield strength of 920 MPa with an elongation of 37%. By microstructural observation, the excellent mechanical properties of the stir zone material were attributed to the partially recrystallized heterogeneous structure, with which the synergetic strengthening improved the strength of the HEA with considerably less trade-off in its ductility. This unique phenomenon was unprecedented in any other friction-stir welded conventional alloys and was credited to the low stacking-fault energy and the high grain growth activation energy of the HEA. This work suggests that FSW can not only produce good HEA welds but serve as a special processing technique to enhance mechanical properties of HEAs.

KW - Friction stir welding

KW - Heterogeneous structure

KW - High-entropy alloys

KW - Mechanical properties

KW - Recrystallization

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Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy

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