First-principles prediction of the deformation modes in austenitic Fe-Cr-Ni alloys
2016 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 108, no 8, 081903Article in journal (Refereed) PublishedText
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
IdentifiersURN: urn:nbn:se:uu:diva-294588DOI: 10.1063/1.4942809ISI: 000373057000016OAI: oai:DiVA.org:uu-294588DiVA: diva2:930986
FunderSwedish Research CouncilSwedish Foundation for Strategic Research The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Carl Tryggers foundation