Yes, this is indeed a rather rare nominal composition. You can find some info about this alloy in the attached PhD thesis. Your composition is named there as TX63 (check Table 10 in Section 3). 

Thank you sir for your bit information. Some how i got a clue in understanding their behaviour. But for my research work i was needed the exact values of Mechanical and physical properties of that TX63.

Anyway thank you once again Sir. Can you provide me your email id or contact number sir for better communication about the materials properties.