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ABSTRACT
This paper describes the microstructure, texture and tensile properties of the two metastable β titanium alloys (Ti-10V-2Fe-3Al and Ti-5Al-5Mo-5V-3Cr). Both the alloys exhibit the single β (body centered cubic) phase in β solution treated and water quenched (β ST WQ) condition. The β ST WQ samples were aged at two different temperatures (550 and 750 °C) and different aging times (2, 4 and 6 hrs). The aging has resulted in different α phase morphologies of a phase precipitates. The sizes and volume fractions of the a phase increase and decrease with increase in aging temperature, respectively. The higher aging temperature (750 °C) results in precipitation free zones (PFZ) within the vicinity of prior β grain boundaries. The a phase texture is basal and it changes to non-basal with increase in aging time. The sharp a phase texture consists of {0001} || ND fibre with high intensity. The Vickers hardness values of both the alloys increase from β ST WQ to all aging temperatures due to precipitation hardening. The specimens aged at 550 °C have resulted in high strength in alloy Ti-1023. In contrast, 750 °C aged samples of both the alloys result in lower strength and moderate elongation values.
Acknowledgments
The authors wish to acknowledge DRDO for financial support. We are grateful to Dr Dr. G. Madhusudan Reddy, Director and Dr D K Das, Associate Director, DMRL for their kind encouragement and support. The authors also thank members of EMG, SFAG, MEG, MBG, TAG, MWG and ACG groups of DMRL for the provision of experimental facilities /support.
Disclosure of interest
No potential conflict of interest was reported by the author(s).