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  Unveiling the underlying mechanism of forming edge cracks upon high strain-rate rolling of magnesium alloy

Zhu, B., Liu, X., Xie, C., Su, J., Guo, P., Tang, C., et al. (2020). Unveiling the underlying mechanism of forming edge cracks upon high strain-rate rolling of magnesium alloy. Journal of Materials Science & Technology, 50, 59-65. doi:10.1016/j.jmst.2020.03.006.

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 Creators:
Zhu, Biwu1, Author
Liu, Xiao1, Author
Xie, Chao2, Author
Su, Jing3, Author              
Guo, Pengcheng4, Author
Tang, Changping1, Author
Liu, Wenhui1, Author
Affiliations:
1Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China, ou_persistent22              
2Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China, ou_persistent22              
3High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
4College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410004, China, ou_persistent22              

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Free keywords: Aluminum alloys; Crack tips; Dynamic recrystallization; Dynamics; Grain boundaries; Magnesium alloys; Rolling; Strain hardening; Ternary alloys; Zinc alloys, AZ31 magnesium alloy; Dynamic recrystallization (DRX); Edge cracks; Fine grain structure; High strain-rate rollings; Secondary cracks; Sharp crack; Triple junction, Strain rate
 Abstract: In the current study, high strain-rate rolling (≥10 s−1) has been successfully employed to produce Mg-3Al-1Zn alloy sheets to a high reduction of 82 with a fine grain structure in a single pass. The underlying mechanism of forming primary and secondary edge cracks has been investigated. It is found that dynamic recrystallization (DRX) induced by subgrains tends to blunt cracks, while twinning-induced DRX is mainly observed around sharp crack tips. The motion of emitted dislocations from blunted cracks is inhibited by the DRX grain boundaries. This, on one hand, increases local work hardening, and on the other hand, causes stress concentration along grain boundaries especially in the triple junctions leading to the formation of secondary cracks. © 2020

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Language(s): eng - English
 Dates: 2020-08-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmst.2020.03.006
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Title: Journal of Materials Science & Technology
  Other : J. Mater. Sci. Technol.
Source Genre: Journal
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Publ. Info: Shenyang, China : Editorial Board of Journal of Materials Science and Technology
Pages: - Volume / Issue: 50 Sequence Number: - Start / End Page: 59 - 65 Identifier: ISSN: 1005-0302
CoNE: https://pure.mpg.de/cone/journals/resource/954925584235