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Effect of multicomponent alloying with Ni, Mn and Mo on phase stability of bcc Fe-Cr alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Materials Center Leoben Forschung GmbH, Leoben, Austria.
2018 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 150, p. 117-129Article in journal (Refereed) Published
Abstract [en]

Fe-Cr system attracts lot of attention in condensed matter physics due to its technological importance and extraordinary physics related to a non-trivial interplay between magnetic and chemical interactions. However, the effect of multicomponent alloying on the properties of Fe-Cr alloys are less studied. We have calculated the mixing enthalpy, magnetic moments, effective chemical, strain-induced and magnetic exchange interactions to investigate the alloying effect of Ni, Mn, Mo on the phase stability of the ferromagnetic bcc Fe−Cr system at zero K. We demonstrate that the alloying reduces the stability of Fe-Cr alloys and expands the region of spinodal decomposition. At the same time, the mixing enthalpy in ternary Fe100-≿-05Cr≿Ni05 alloys indicates a stability of solid solution phase up to 6 at. % Cr. In Fe100-≿-07Cr≿Ni05Mn01Mo01 alloys, we did not find any alloy composition that has negative enthalpy of formation. Analyzing magnetic and electronic properties of the alloys and investigating magnetic, chemical and strain-induced interactions in the studied systems, we provide physically transparent picture of the main factors leading to the destabilization of the Fe-Cr solid solutions by the multicomponent alloying with Ni, Mn, Mo.

Place, publisher, year, edition, pages
Acta Materialia Inc , 2018. Vol. 150, p. 117-129
Keywords [en]
Fe-Cr system, First-principles calculations, Mixing enthalpy, Multicomponent alloying, Phase stability, Spinodal decompositon
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227570DOI: 10.1016/j.actamat.2018.02.007ISI: 000433272400011Scopus ID: 2-s2.0-85045886801OAI: oai:DiVA.org:kth-227570DiVA, id: diva2:1206135
Note

QC 20180516

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-06-27Bibliographically approved

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Ruban, Andrei V.

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