Assessment of the thermodynamic dimension of the stacking fault energy |
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| Authors: | D Geissler J Freudenberger A Kauffmann S Martin D Rafaja |
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| Institution: | 1. Institute of Materials Science, TU Bergakademie Freiberg, 09596 Freiberg, Germany.David.Geissler@iww.tu-freiberg.de;3. Institute of Materials Science, TU Bergakademie Freiberg, 09596 Freiberg, Germany.;4. Institute for Metallic Materials, IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.;5. Institute of Materials Science, TU Dresden, 01062 Dresden, Germany.;6. Institute for Metallic Materials, IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany. |
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| Abstract: | Especially with respect to high Mn and other austenitic TRansformation and/or TWinning Induced Plasticity (TRIP/TWIP) steels, it is a current trend to model the stacking fault energy of a stacking fault that is formed by plastic deformation with an equilibrium thermodynamic formalism as proposed by Olson and Cohen in 1976. In the present paper, this formalism is critically discussed and its ambiguity is stressed. Suggestions are made, how the stacking fault energy and its relation to the formation of hexagonal ?-martensite might be treated appropriately. It is further emphasized that a thermodynamic treatment of deformation-induced stacking fault phenomena always faces some ambiguity. However, an alternative thermodynamic approach to stacking faults, twinning and the formation of ?-martensite in austenitic steels might rationalize the specific stacking fault arrangements encountered during deformation of TRIP/TWIP alloys. |
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| Keywords: | TWIP TRIP deformation twinning stacking fault stacking fault energy ?-martensite |
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