On the room temperature deformation mechanisms of a Mg-Y-Zn alloy with long-period-stacking-ordered structures
- Authors
- Kim, Jin Kyung; Sandlöbes, Stefanie; Raabe, Dierk
- Issue Date
- Jan-2015
- Publisher
- Elsevier BV
- Keywords
- Deformation structures; Dislocations; Long-period-stacking-ordered structure; Magnesium alloy; Transmission electron microscopy
- Citation
- Acta Materialia, v.82, pp.414 - 423
- Indexed
- SCIE
SCOPUS
- Journal Title
- Acta Materialia
- Volume
- 82
- Start Page
- 414
- End Page
- 423
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/20213
- DOI
- 10.1016/j.actamat.2014.09.036
- ISSN
- 1359-6454
- Abstract
- We present a transmission electron microscopy study on the room temperature deformation mechanisms in a Mg97Y2Zn1 (at.%) alloy with long-period-stacking-order (LPSO) phase. The alloy consists of α-Mg matrix with platelet-shaped LPSO precipitates 3-5 nm thick and interdendritic LPSO (18R structures) phase grains. The interdendritic LPSO phase was found to deform either by kink-banding in conjunction with basal <a> slip or by basal <a> slip and the formation of dislocation walls. No orientation dependence of these different deformation modes was observed. The α-Mg matrix deforms by basal <a> slip and pyramidal <c + a> slip. No twinning was observed in the α-Mg matrix during room temperature deformation. The elastic modulus mismatch between α-Mg matrix and LPSO plates is suggested to be the main source for activating non-basal dislocations. The combination of the soft α-Mg matrix strengthened by LPSO precipitates and harder bulk interdendritic LPSO grains is suggested to contribute to the well-known good mechanical properties of Mg-LPSO alloys at room temperature. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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