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First-principles prediction of the deformation modes in austenitic Fe-Cr-Ni alloys
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.;Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland..
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland..
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2016 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 108, no 8, 081903Article in journal (Refereed) PublishedText
Abstract [en]

First-principles alloy theory is used to establish the gamma-surface of Fe-Cr-Ni alloys as function of chemical composition and temperature. The theoretical stacking fault energy (SFE) versus chemistry and temperature trends agree well with experiments. Combining our results with the recent plasticity theory based on the gamma-surface, the stacking fault formation is predicted to be the leading deformation mechanism for alloys with effective stacking fault energy below similar to 18 mJ m(-2). Alloys with SFE above this critical value show both twinning and full slip at room temperature. Interestingly, twinning remains a possible deformation mode in addition to full slip even at elevated temperatures, in line with observations.

Place, publisher, year, edition, pages
2016. Vol. 108, no 8, 081903
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-294588DOI: 10.1063/1.4942809ISI: 000373057000016OAI: oai:DiVA.org:uu-294588DiVA: diva2:930986
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Carl Tryggers foundation
Available from: 2016-05-26 Created: 2016-05-25 Last updated: 2016-05-26Bibliographically approved

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Vitos, Levente
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