Despite a number of large-scale molecular dynamics simulations of shock compressed iron, the morphological properties of simulated recovered samples are still unexplored. Key questions remain open in this area, including the role of dislocation motion and deformation twinning in shear stress release. In this study, we present simulations of homogeneous uniaxial compression and recovery of large polycrystalline iron samples. Our results reveal significant recovery of the body-centered cubic grains with some deformation twinning driven by shear stress, in agreement with experimental results by Wang et al. [Sci. Rep. 3, 1086 (2013)]. The twin fraction agrees reasonably well with a semi-analytical model which assumes a critical shear stress for twinning. On reloading, twins disappear and the material reaches a very low strength value.
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28 February 2015
Research Article|
February 25 2015
Morphological changes in polycrystalline Fe after compression and release
Nina Gunkelmann
;
Nina Gunkelmann
a)
1Physics Department and Research Center OPTIMAS,
University Kaiserslautern
, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany
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Diego R. Tramontina
;
Diego R. Tramontina
2Instituto de Ciencias Básicas,
Universidad Nacional de Cuyo
, Mendoza 5500, Argentina
3
CONICET
, Mendoza 5500, Argentina
4Instituto de Bioingeniería,
Universidad de Mendoza
, Mendoza M5502BZ, Argentina
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Eduardo M. Bringa;
Eduardo M. Bringa
2Instituto de Ciencias Básicas,
Universidad Nacional de Cuyo
, Mendoza 5500, Argentina
3
CONICET
, Mendoza 5500, Argentina
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Herbert M. Urbassek
Herbert M. Urbassek
1Physics Department and Research Center OPTIMAS,
University Kaiserslautern
, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany
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a)
Electronic address: [email protected]
J. Appl. Phys. 117, 085901 (2015)
Article history
Received:
November 19 2014
Accepted:
February 15 2015
Citation
Nina Gunkelmann, Diego R. Tramontina, Eduardo M. Bringa, Herbert M. Urbassek; Morphological changes in polycrystalline Fe after compression and release. J. Appl. Phys. 28 February 2015; 117 (8): 085901. https://doi.org/10.1063/1.4913622
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