Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

Hagihara, Koji; Yamasaki, Michiaki; Kawamura, Yoshihito et al.

Materials Science and Engineering A, 2019, 763, 138163

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Identifier to cite or link to this item: https://hdl.handle.net/11094/89816

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Title
Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands
Creator
NRID
1000010346182 1000010346182
researchmap permalink
read0191194 read0191194
Scopus Author ID
7007016278 7007016278
CreatorName
Hagihara, Koji
NRID
1000050343885 1000050343885
CreatorName
Yamasaki, Michiaki
NRID
1000030250814 1000030250814
CreatorName
Kawamura, Yoshihito
NRID
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
CreatorName
Nakano, Takayoshi
Subject
Basal slip
Deformation kink band
Dislocation
LPSO-Phase
Microstructure
Description
Hagihara K., Yamasaki M., Kawamura Y., et al. Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands. Materials Science and Engineering A, 763, 138163. https://doi.org/10.1016/j.msea.2019.138163.
Abstract
The mechanical properties of the Mg-based LPSO-phase are expected to be strongly affected by the microstructure due to its anisotropic crystal structure. However, the fine details have not been sufficiently understood yet. This study first clarified the detailed microstructural factors that govern the strength of the LPSO-phase by examining alloys with microstructures that were significantly varied via directional solidification and extrusion processes. Refining the microstructure is significantly effective for strengthening LPSO-phase alloys. The yield stress of LPSO-phase alloys with random texture was previously reported to be increased by reducing the “length” of plate-like LPSO-phase grains. In addition, it was found in this study that the formation stress in the deformation kink band, which is a unique deformation mode in an LPSO-phase alloy, can be increased by decreasing the “thickness” of the grains. Furthermore, the study used directionally solidified crystals provided direct evidence that the introduction of the deformation kink band effectively increases the yield stress and work-hardening rate of alloys by hindering the motion of basal dislocations. This “kink-band strengthening” was found to have considerable temperature dependence. The strengthening is significant at or below 200 °C, but the effect gradually decreases above 300 °C and is accompanied by the operation of non-basal slip. The results quantitatively clarified that kink-band strengthening is one predominant reason why the LPSO-phase extruded alloy exhibits an unusually high yield stress at any loading orientation.
Publisher
Elsevier
Source Title
Materials Science and Engineering A
Volume (Issue)
763
Page
138163
Date of Issued
2019-08-19
Language
English
Handle URL
https://hdl.handle.net/11094/89816
PISSN
09215093
NCID
AA10720420
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.msea.2019.138163
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
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Category
学術雑誌論文 Journal Article