PREMARTENSITIC BEHAVIOR IN METASTABLE PHASES OF SUPERSATURATED ALLOYS

摘要

Pretransition phenomena observed in four commercial alloy systems of β-C Ti, Al-Mg-Cu, Fe-Cu and Fe-N steel are reported. For the microscopic origin of the modulated structures, it is conjectured that orbital splitting of incomplete 3d electrons in the alloying elements causes electron-phonon coupled lattice displacements through Jahn-Teller distortions.