Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy
Abstract
Strain-induced martensitic transformations can improve the strength and ductility of some face centered cubic (FCC) metals and alloys. Irradiation-induced defects such as vacancies, dislocation loops, and voids activate martensitic transformations over a wider range of mechanical loading conditions than in pristine material. Furthermore, the mechanisms underlying irradiation-enabled martensite transformations remain unclear. In this work, we use molecular dynamics simulations to study the effect of vacancies and voids on strain-induced martensitic transformations in a model concentrated solid solution alloy Fe-50 at.% Ni. It has been found that single vacancies have no resolvable effect on the transformation because they reduce the stacking fault energy by a relatively insignificant margin and do so only if the vacancy is located on the stacking fault plane. Voids, however, activate the martensite transformation through shear strain accumulation around the void due to dislocation pileup. The larger the void, the more pronounced this effect.
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States)
- Publication Date:
- Research Org.:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1830710
- Alternate Identifier(s):
- OSTI ID: 1830286; OSTI ID: 1865716
- Grant/Contract Number:
- SC0020150; -SC0020150
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scripta Materialia
- Additional Journal Information:
- Journal Volume: 209; Journal ID: ISSN 1359-6462
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Molecular dynamics; Martensitic phase transformation; Crystal defects; Concentrated solid solution
Citation Formats
Yang, Chao, Pachaury, Yash, El-Azab, Anter, and Wharry, Janelle. Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy. United States: N. p., 2021.
Web. doi:10.1016/j.scriptamat.2021.114394.
Yang, Chao, Pachaury, Yash, El-Azab, Anter, & Wharry, Janelle. Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy. United States. https://doi.org/10.1016/j.scriptamat.2021.114394
Yang, Chao, Pachaury, Yash, El-Azab, Anter, and Wharry, Janelle. Sun .
"Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy". United States. https://doi.org/10.1016/j.scriptamat.2021.114394. https://www.osti.gov/servlets/purl/1830710.
@article{osti_1830710,
title = {Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy},
author = {Yang, Chao and Pachaury, Yash and El-Azab, Anter and Wharry, Janelle},
abstractNote = {Strain-induced martensitic transformations can improve the strength and ductility of some face centered cubic (FCC) metals and alloys. Irradiation-induced defects such as vacancies, dislocation loops, and voids activate martensitic transformations over a wider range of mechanical loading conditions than in pristine material. Furthermore, the mechanisms underlying irradiation-enabled martensite transformations remain unclear. In this work, we use molecular dynamics simulations to study the effect of vacancies and voids on strain-induced martensitic transformations in a model concentrated solid solution alloy Fe-50 at.% Ni. It has been found that single vacancies have no resolvable effect on the transformation because they reduce the stacking fault energy by a relatively insignificant margin and do so only if the vacancy is located on the stacking fault plane. Voids, however, activate the martensite transformation through shear strain accumulation around the void due to dislocation pileup. The larger the void, the more pronounced this effect.},
doi = {10.1016/j.scriptamat.2021.114394},
journal = {Scripta Materialia},
number = ,
volume = 209,
place = {United States},
year = {Sun Nov 14 00:00:00 EST 2021},
month = {Sun Nov 14 00:00:00 EST 2021}
}
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