초록 close

Pretransition phenomena observed in four commercial alloy systems of ß-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's bain distortions. This metastable phases are to be represented by a periodic regularity of electronic distribution, which could act as a role of an abnormal structural constitution about the modulated strain field and an additional ordered diffraction in TEM observation.


Pretransition phenomena observed in four commercial alloy systems of ß-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's bain distortions. This metastable phases are to be represented by a periodic regularity of electronic distribution, which could act as a role of an abnormal structural constitution about the modulated strain field and an additional ordered diffraction in TEM observation.