The impact of short range order on Fe-Cr thermodynamics

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Abstract

Using atomistic simulations of Fe-Cr alloys and computational thermodynamics techniques, we study the influence of short range order, SRO, on the location of the α-α' miscibility gap. By comparing the random alloy to the short range ordered alloy, we extract the contributions of SRO to the free energy coming from the enthalpy of mixing, and from the vibrational and configurational entropies. The obtained phase diagram is compared to the standard Fe-Cr phase diagram and additional experimental data. We conclude that the effects of SRO are significant, doubling the solubility limit of Cr at low temperatures (≈ 300 K), and that this effect is mainly due to the contribution of SRO to the enthalpy.

Details

Original languageEnglish
Title of host publicationTackling Materials Complexities via Computational Science
Place of PublicationTallahassee, FL, United States
Pages379-382
Volume1
Publication statusPublished - 27 Oct 2008
EventFourth International Conference on Multiscale Materials Modeling - The Department of Scientific Computing, Florida State University, Tallahassee, Florida, United States
Duration: 27 Oct 200831 Oct 2008

Conference

ConferenceFourth International Conference on Multiscale Materials Modeling
CountryUnited States
CityTallahassee, Florida
Period2008-10-272008-10-31

Keywords

  • Fe-Cr, Computational thermodynamics, Solubility limit, Short range order

ID: 179211