Low temperature transformation in the b-metastable Ti-5553 alloy
Résumé
Phase transformation of the b metastable phase Was characterized at low temperature in the Ti-5553 alloy. Electrical resistivity and High Energy X-Ray Diffraction were utilized to characterize transformation kinetics along two thermal paths: i) direct quenching from stable b-domain to the isothermal transformation temperature of 325 degrees C, and ii) quenching from stable b-domain to room temperature and further ageing at 325 degrees C. Both treatments led to different transformation sequences with formation of w and/or a''. Mean cell parameters of b and a'' were obtained all along the transformation. Results suggest a transformation with poor solute partitioning and large stress building of in each phase.