Free volume formation and the high strength of pure Mg after room temperature core-sheath ECAP passes
SCIE
SCOPUS
- Title
- Free volume formation and the high strength of pure Mg after room temperature core-sheath ECAP passes
- Authors
- Heydarinia, Ali; Mohri, Maryam; Asghari-Rad, Peyman; Kim, Hyoung Seop; Nili-ahmadabadi, Mahmoud
- Date Issued
- 2022-05
- Publisher
- Elsevier Editora Ltda
- Abstract
- © 2022The present investigation is conducted to successfully deform pure Mg by equal-channel angular pressing (ECAP: channel angle 90°, corner angle 20°) using core-sheath configuration at room temperature. The microstructure of the sample after 4 passes of ECAP contained an average grain size of ∼0.3 μm and an excess free volume of ∼0.63% due to the formation of defects and dislocations during the ECAP process. The results show that local temperature increases up to 200 °C during the ECAP process causes dynamic recovery and recrystallization in the microstructure during deformation. The texture analysis shows that the first pass activates the non-basal sliding systems and the 4 passes present a relatively strong (0002) fiber texture. The highest ever reported tensile toughness of SPD processed pure Mg of about 1.784 GPa% with remarkable mechanical properties were achieved after 4 passes with an ultimate tensile strength of 223 MPa, yield stress of 170 MPa, and an elongation to failure of 8%.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/114641
- DOI
- 10.1016/j.jmrt.2022.02.061
- ISSN
- 2238-7854
- Article Type
- Article
- Citation
- Journal of Materials Research and Technology, vol. 18, page. 147 - 158, 2022-05
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