|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Technical Division Student Poster Competition
||SPU-13 : Generalized Stacking Fault Energies of Multicomponent Alloys
||Jonas Kaufman, Josh Sanz, Greg Pomrehn, Aurora Pribram-Jones, Reza Mahjoub, Kevin Laws, Michael Ferry, Lori Bassman
|On-Site Speaker (Planned)
Ductility is a desirable property for metallic alloys that is difficult to model directly. However stacking fault energy is an indicator of ductility in fcc alloys, as it dictates dislocation mobility. A generalized stacking fault energy (GSFE) curve contains not only stable stacking fault energies, but also energy barriers to stacking fault formation. These unstable energies, while experimentally inaccessible, are thought to be important in determining deformation behavior. This study examines a direct method for calculating GSFE in multicomponent alloys using special quasirandom structures along with density functional calculations. The method was validated against literature results for several pure elements and binaries. GSFE curves for quaternary high entropy brass/bronze and precious metal systems have been calculated and compared to experimentally observed ductility and twinning behavior. The results of the direct GSFE method were also compared to estimates of stable stacking fault energies using a more computationally efficient method.
||Definite: None Selected