Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys

Hagihara, Koji; Li, Zixuan; Yamasaki, Michiaki et al.

Acta Materialia, 2019, 163, 226-239

Number of Access:595（2025-08-21 04:36 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89825

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Title
Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys
Creator
NRID
1000010346182 1000010346182
researchmap permalink
read0191194 read0191194
Scopus Author ID
7007016278 7007016278
CreatorName
Hagihara, Koji
CreatorName
Li, Zixuan
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
Deformation kink
Deformation structure
Extrusion
Magnesium alloys
Strengthening mechanism
Description
Hagihara K., Li Z., Yamasaki M., et al. Strengthening mechanisms acting in extruded Mg-based long-period stacking ordered (LPSO)-phase alloys. Acta Materialia, 163, 226. https://doi.org/10.1016/j.actamat.2018.10.016.
Abstract
The unusual increase in the strength by extrusion is a unique feature of recently developed Mg alloys containing the LPSO phase. In this study, we first elucidated the detailed mechanisms that induce this drastic strengthening. The dependencies of the deformation behavior of a Mg88Zn4Y7 extruded alloy, which contains ∼86-vol% LPSO phase, on the temperature, loading orientation, and extrusion ratio were examined. It was found that the yield stress of the alloy is drastically increased by extrusion, but the magnitude of the increase in the yield stress is significantly different depending on the loading orientation. That is, the strengthening of the LPSO phase by extrusion shows a strong anisotropy. By the detailed analyses, this was clarified to be derived from the variation in the deformation mechanisms depending on the loading orientation and extrusion ratio. Basal slip was found to govern the deformation behavior when the loading axis was inclined at a 45° to the extrusion direction, while the predominant deformation mechanism varies from basal slip to the formation of deformation kink bands as the extrusion ratio increased when the loading axis was parallel to the extrusion direction. Moreover, it was clarified in this study that the introduction of a deformation-kink-band boundary during extrusion effectively acts as a strong obstacle to basal slip. That is, “the kink band strengthening” was first quantitatively elucidated, which contributes to the drastic increase in the yield stress of the extruded LPSO-phase alloys in the wide temperature range below 400 °C.
Publisher
Acta Materialia Inc.
Source Title
Acta Materialia
Volume (Issue)
163
Page
226-239
Date of Issued
2019-01-15
Language
English
Handle URL
https://hdl.handle.net/11094/89825
PISSN
13596454
NCID
AA1106787X
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.actamat.2018.10.016
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