Tension–compression creep asymmetry in strong-textural Mg-RE alloy due to <c + a> dislocation reconfiguration

Dongdong Zhang; Sheng Wang; Chaojie Che; Zhanyong Zhao; Ke Li; Zhangbo Ma; Peikang Bai

doi:10.1080/21663831.2024.2342511

Materials Research Letters (Jun 2024)

Tension–compression creep asymmetry in strong-textural Mg-RE alloy due to <c + a> dislocation reconfiguration

Dongdong Zhang,
Sheng Wang,
Chaojie Che,
Zhanyong Zhao,
Ke Li,
Zhangbo Ma,
Peikang Bai

Affiliations

Dongdong Zhang: College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, People’s Republic of China
Sheng Wang: State Key Laboratory of Rare Earth Resources Utilization, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun, People’s Republic of China
Chaojie Che: State Key Laboratory of Rare Earth Resources Utilization, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun, People’s Republic of China
Zhanyong Zhao: School of Materials Science and Engineering, North University of China, Taiyuan, People’s Republic of China
Ke Li: College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, People’s Republic of China
Zhangbo Ma: College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, People’s Republic of China
Peikang Bai: College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, People’s Republic of China

DOI: https://doi.org/10.1080/21663831.2024.2342511
Journal volume & issue: Vol. 12, no. 6
pp. 442 – 449

Abstract

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Strong-textural Mg-RE alloy exhibits creep asymmetry at 200°C, with a much higher creep resistance in compression than in tension, albeit a higher yield strength in tension than in compression. Creep asymmetry is ascribed to the non-Schmid effects of pyramidal slip, which enables a higher friction in compression and thus induces a lower mobility of pyramidal slip in compression than in tension. Additionally, the dissociation of dislocations into sessile structures in compression is more frequent than in tension, which contributes to the hardening response and thus lowers the compressive creep rate.

Published in Materials Research Letters

ISSN: 2166-3831 (Online)
Publisher: Taylor & Francis Group
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.tandfonline.com/journals/tmrl

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