Generalized stacking fault energy of gamma-Fe
2016 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 96, no 6, 524-541 p.Article in journal (Refereed) PublishedText
We investigate the generalized stacking fault energy ( [GRAPHICS] -surface) of paramagnetic [GRAPHICS] -Fe as a function of temperature. At static condition, the face-centred cubic (fcc) lattice is thermodynamically unstable with respect to the hexagonal close-packed lattice, resulting in a negative intrinsic stacking fault energy (ISF). However, the unstable stacking fault energy (USF), representing the energy barrier along the [GRAPHICS] -surface connecting the ideal fcc and the intrinsic stacking fault positions, is large and positive. The ISF is calculated to have a strong positive temperature coefficient, while the USF decreases monotonously with temperature. According to the recent plasticity theory, the overall effect of temperature is to move paramagnetic fcc Fe from the stacking fault formation regime ( [GRAPHICS] K) towards maximum twinning ( [GRAPHICS] K) and finally to a dominating full-slip regime ( [GRAPHICS] K). Our predictions are discussed in connection with the available experimental observations.
Place, publisher, year, edition, pages
2016. Vol. 96, no 6, 524-541 p.
-Fe, plasticity, stacking fault energy
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-283788DOI: 10.1080/14786435.2016.1140912ISI: 000372097300001OAI: oai:DiVA.org:uu-283788DiVA: diva2:919614
FunderSwedish Research CouncilSwedish Foundation for Strategic Research EU, European Research Council