Ti-GR5 is the most frequently used Ti - Alloy because of its excellent strength-to-weight ratio which makes it particulartly suitable for aerospace applications where a good combination of mechanical properties up to approximately 400°C, formability, weldability and toughness is a mandatory engineering requirement.The alloying elements influence the temperature at which the cristallograhic transformation (β-Transus) from (α) phase (HCP) to the Beta (β) phase (BCC) occurs.The nominal 6.0% of Aluminium (an α-phase stabiliser element) contributes to strengthen the low temperature α-phase by solid solution; nominal 4% Vanadium (a β-phase stabiliser element), although exceeding the α-solubility limit at any temperature, confers heat-treatment capability allowing the achievement of consistent strengthening.
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