Characterization of Staggered Twin Formation in HCP Magnesium

M. Arul Kumar; B. Leu; P. Rottmann; I. J. Beyerlein

doi:10.1007/978-3-030-05789-3_31

Characterization of Staggered Twin Formation in HCP Magnesium

M. Arul Kumar, B. Leu, P. Rottmann, I. J. Beyerlein

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

4 Scopus citations

Abstract

Twins in hexagonal close-packed polycrystals, most often nucleate at grain-boundaries (GBs), propagate into the grain and terminate at opposing GBs. Regularly, multiple parallel twins of the same variant form inside the same grain. When twins terminate inside the grains, rather than the grain boundary, they tend to form a staggered structure. Whether a staggered twin structure or the more common grain spanning twin structure forms can greatly affect mechanical behavior. In this work, the underlying mechanism for the formation of staggered twins is studied using an elasto-visco-plastic fast Fourier transform model, which quantifies the local stresses associated with -type staggered twins in magnesium for different configurations. The model results suggest that when a twin tip is close to the lateral side of another twin, the driving force for twin propagation is significantly reduced. As a result, the staggered twin structure forms.

Original language	English
Title of host publication	Magnesium Technology, 2019
Editors	J. Brian Jordon, Vineet V. Joshi, Neale R. Neelameggham, Dmytro Orlov
Pages	207-213
Number of pages	7
DOIs	https://doi.org/10.1007/978-3-030-05789-3_31
State	Published - 2019
Event	Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2019 - San Antonio, United States Duration: Mar 10 2019 → Mar 14 2019

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2019
Country/Territory	United States
City	San Antonio
Period	3/10/19 → 3/14/19

Bibliographical note

Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society.

Funding

Acknowledgements This work is fully funded by the US Department of Energy, Office of Basic Energy Sciences Project FWP 06SCPE401. I.J.B. acknowledges financial support from the National Science Foundation (NSF CMMI-1729887). BL acknowledges financial support from the National Defense Science and Engineering Graduate (NDSEG) Fellowship. The authors thank Luoning Ma (Johns Hopkins University) for the preparation of TEM specimen.

Funders	Funder number
Office of Basic Energy Sciences	FWP 06SCPE401
US Department of Energy
National Science Foundation (NSF)	1729887, CMMI-1729887
National Defense Science and Engineering Graduate

Keywords

Crystal plasticity
Deformation twins
Local stresses
Magnesium
Staggered structure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/978-3-030-05789-3_31

Cite this

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title = "Characterization of Staggered Twin Formation in HCP Magnesium",

abstract = "Twins in hexagonal close-packed polycrystals, most often nucleate at grain-boundaries (GBs), propagate into the grain and terminate at opposing GBs. Regularly, multiple parallel twins of the same variant form inside the same grain. When twins terminate inside the grains, rather than the grain boundary, they tend to form a staggered structure. Whether a staggered twin structure or the more common grain spanning twin structure forms can greatly affect mechanical behavior. In this work, the underlying mechanism for the formation of staggered twins is studied using an elasto-visco-plastic fast Fourier transform model, which quantifies the local stresses associated with -type staggered twins in magnesium for different configurations. The model results suggest that when a twin tip is close to the lateral side of another twin, the driving force for twin propagation is significantly reduced. As a result, the staggered twin structure forms.",

keywords = "Crystal plasticity, Deformation twins, Local stresses, Magnesium, Staggered structure",

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doi = "10.1007/978-3-030-05789-3\_31",

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Arul Kumar, M, Leu, B, Rottmann, P & Beyerlein, IJ 2019, Characterization of Staggered Twin Formation in HCP Magnesium. in JB Jordon, VV Joshi, NR Neelameggham & D Orlov (eds), Magnesium Technology, 2019. Minerals, Metals and Materials Series, pp. 207-213, Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2019, San Antonio, United States, 3/10/19. https://doi.org/10.1007/978-3-030-05789-3_31

Characterization of Staggered Twin Formation in HCP Magnesium. / Arul Kumar, M.; Leu, B.; Rottmann, P. et al.
Magnesium Technology, 2019. ed. / J. Brian Jordon; Vineet V. Joshi; Neale R. Neelameggham; Dmytro Orlov. 2019. p. 207-213 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AB - Twins in hexagonal close-packed polycrystals, most often nucleate at grain-boundaries (GBs), propagate into the grain and terminate at opposing GBs. Regularly, multiple parallel twins of the same variant form inside the same grain. When twins terminate inside the grains, rather than the grain boundary, they tend to form a staggered structure. Whether a staggered twin structure or the more common grain spanning twin structure forms can greatly affect mechanical behavior. In this work, the underlying mechanism for the formation of staggered twins is studied using an elasto-visco-plastic fast Fourier transform model, which quantifies the local stresses associated with -type staggered twins in magnesium for different configurations. The model results suggest that when a twin tip is close to the lateral side of another twin, the driving force for twin propagation is significantly reduced. As a result, the staggered twin structure forms.

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Characterization of Staggered Twin Formation in HCP Magnesium

Abstract

Publication series

Conference

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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