The enhanced warm temperature ductility of Ti-6Al-4V alloy through strain induced martensite reversion and recrystallization

• Published in: Materials letters 2021-11, Vol.302, p.130405, Article 130405
• Main Authors: Paghandeh, M., Zarei-Hanzaki, A., Abedi, H.R., Vahidshad, Y.
• Format: Article
• Language: English
• Subjects: Deformation and fracture; Ductility; Dynamic recrystallization; Martensite; Martensite reverse transformation; Martensitic transformations; Materials science; Microstructure; Recrystallization; Thermomechanical treatment; Titanium alloys; Titanium base alloys
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.130405

•Cold to warm deformation of dual phase α+ά and full ά martensite microstructures.•Enhanced ductility due to strain induced reverse martensitic transformation.•Development of trimodal microstructure during processing of dual phase α+ά.•Lower extent of transformation and ductility in fully martensite microstructure. Two different initial microstructures of Ti-6Al-4V alloy, α+ά dual phase and fully ά-martensite, were deformed in tensile mode at warm temperatures of 300 °C and 600 °C. The simultaneous occurrence of martensite reverse transformation and dynamic recrystallization were identified as the main responsible to enhance the ductility values. A bimodal/trimodal microstructure arose during the thermomechanical processing of the dual phase α+ά at 600 °C which resulted in an acceptable balance between strength and ductility. The lower ductility of full ά martensite than dual phase α+ά microstructure was related to the lower extent of involved strain accommodation mechanisms and absence of load transition mechanism.