Publication Date:
2016-02-26
Description:
First-principles alloy theory is used to establish the γ -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 γ -surface, the stacking fault formation is predicted to be the leading deformation mechanism for alloys with effective stacking fault energy below ∼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.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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