The influence of lamellar twins on deformation mechanism in nanocrystalline magnesium under uniaxial compression

Chuanlong Xu; Lin Yuan; Debin Shan; Bin Guo

doi:10.1007/s10853-019-03803-2

The influence of lamellar twins on deformation mechanism in nanocrystalline magnesium under uniaxial compression

Chuanlong Xu
, Lin Yuan^*
, Debin Shan
, Bin Guo

^*Corresponding author for this work

National Key Laboratory for Precision Hot Processing of Metals
Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Molecular dynamics simulation is employed to investigate the deformation mechanism of nanocrystalline (NC) Mg with lamellar { 10 1 ¯ 1 } twins. Five models including a twin-free model and four nanotwinned models with increasing twin boundary (TB) spacing from 2.5 to 20 nm are simulated under uniaxial compressive strain rate of 1 × 10⁸ s⁻¹ at 300 K. Compared with notwinned NC Mg, the introduction of lamellar twin structure can decrease the strength that behaves as a softening mechanism due to the migration of initial TB and newly formed twins. The strength decreases with the reduction in TB spacing. In addition, the model with TB spacing of 2.5 nm is also simulated under uniaxial compression at 0.01 K and 500 K in order to study the effect of temperature. The result shows that the compressive stress increases as the temperature decrease due to the promotion of grain boundary motion and TB migration.

Original language	English
Pages (from-to)	12623-12642
Number of pages	20
Journal	Journal of Materials Science
Volume	54
Issue number	19
DOIs	https://doi.org/10.1007/s10853-019-03803-2
State	Published - 15 Oct 2019
Externally published	Yes

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title = "The influence of lamellar twins on deformation mechanism in nanocrystalline magnesium under uniaxial compression",

abstract = "Molecular dynamics simulation is employed to investigate the deformation mechanism of nanocrystalline (NC) Mg with lamellar \{ 10 1 ¯ 1 \} twins. Five models including a twin-free model and four nanotwinned models with increasing twin boundary (TB) spacing from 2.5 to 20 nm are simulated under uniaxial compressive strain rate of 1 × 108 s−1 at 300 K. Compared with notwinned NC Mg, the introduction of lamellar twin structure can decrease the strength that behaves as a softening mechanism due to the migration of initial TB and newly formed twins. The strength decreases with the reduction in TB spacing. In addition, the model with TB spacing of 2.5 nm is also simulated under uniaxial compression at 0.01 K and 500 K in order to study the effect of temperature. The result shows that the compressive stress increases as the temperature decrease due to the promotion of grain boundary motion and TB migration.",

author = "Chuanlong Xu and Lin Yuan and Debin Shan and Bin Guo",

note = "Publisher Copyright: {\textcopyright} 2019, Springer Science+Business Media, LLC, part of Springer Nature.",

year = "2019",

month = oct,

day = "15",

doi = "10.1007/s10853-019-03803-2",

language = "英语",

volume = "54",

pages = "12623--12642",

journal = "Journal of Materials Science",

issn = "0022-2461",

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TY - JOUR

T1 - The influence of lamellar twins on deformation mechanism in nanocrystalline magnesium under uniaxial compression

AU - Xu, Chuanlong

AU - Yuan, Lin

AU - Shan, Debin

AU - Guo, Bin

PY - 2019/10/15

Y1 - 2019/10/15

N2 - Molecular dynamics simulation is employed to investigate the deformation mechanism of nanocrystalline (NC) Mg with lamellar { 10 1 ¯ 1 } twins. Five models including a twin-free model and four nanotwinned models with increasing twin boundary (TB) spacing from 2.5 to 20 nm are simulated under uniaxial compressive strain rate of 1 × 108 s−1 at 300 K. Compared with notwinned NC Mg, the introduction of lamellar twin structure can decrease the strength that behaves as a softening mechanism due to the migration of initial TB and newly formed twins. The strength decreases with the reduction in TB spacing. In addition, the model with TB spacing of 2.5 nm is also simulated under uniaxial compression at 0.01 K and 500 K in order to study the effect of temperature. The result shows that the compressive stress increases as the temperature decrease due to the promotion of grain boundary motion and TB migration.

AB - Molecular dynamics simulation is employed to investigate the deformation mechanism of nanocrystalline (NC) Mg with lamellar { 10 1 ¯ 1 } twins. Five models including a twin-free model and four nanotwinned models with increasing twin boundary (TB) spacing from 2.5 to 20 nm are simulated under uniaxial compressive strain rate of 1 × 108 s−1 at 300 K. Compared with notwinned NC Mg, the introduction of lamellar twin structure can decrease the strength that behaves as a softening mechanism due to the migration of initial TB and newly formed twins. The strength decreases with the reduction in TB spacing. In addition, the model with TB spacing of 2.5 nm is also simulated under uniaxial compression at 0.01 K and 500 K in order to study the effect of temperature. The result shows that the compressive stress increases as the temperature decrease due to the promotion of grain boundary motion and TB migration.

UR - https://www.scopus.com/pages/publications/85068768460

U2 - 10.1007/s10853-019-03803-2

DO - 10.1007/s10853-019-03803-2

M3 - 文章

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SN - 0022-2461

VL - 54

SP - 12623

EP - 12642

JO - Journal of Materials Science

JF - Journal of Materials Science

IS - 19

ER -

The influence of lamellar twins on deformation mechanism in nanocrystalline magnesium under uniaxial compression

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