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Molecular Dynamics Simulation of Vacancy and Void Effects on Strain-Induced Martensitic Transformations in an FeNi Alloy

21 Pages Posted: 29 Apr 2021 Publication Status: Under Review

See all articles by Yash Pachaury

Yash Pachaury

Purdue University - School of Materials Science and Engineering

Anter El-Azab

Purdue University - School of Materials Science and Engineering

Janelle P. Wharry

Purdue University - School of Materials Science and Engineering

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. However, 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. 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.

Keywords: Molecular dynamics, Martensitic phase transformation, Crystal defects, Iron alloys

Suggested Citation

Pachaury, Yash and El-Azab, Anter and Wharry, Janelle P., Molecular Dynamics Simulation of Vacancy and Void Effects on Strain-Induced Martensitic Transformations in an FeNi Alloy. Available at SSRN: https://ssrn.com/abstract=3836799 or http://dx.doi.org/10.2139/ssrn.3836799

Yash Pachaury

Purdue University - School of Materials Science and Engineering ( email )

West Lafayette, IN
United States

Anter El-Azab

Purdue University - School of Materials Science and Engineering

West Lafayette, IN
United States

Janelle P. Wharry

Purdue University - School of Materials Science and Engineering ( email )

West Lafayette, IN
United States

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