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Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo(atomic fraction,%) was prepared by gas atomization.Powder metallurgy(PM) Ti_2AlNb alloys were prepared by a hot isostatic pressing(HIPing) route.The influence of experimental variables including HIPing temperatures,solution and aging temperatures on microstructure and properties of PM Ti_2AlNb alloys was studied.The results showed that HIPing temperature affected the porosity distribution and mechanical properties of PM Ti_2AlNb alloys.The microstructure and mechanical properties of the PM Ti_2AlNb alloys changed obviously after various post heat treatments,and a good combination of tensile strength,ductility and rupture lifetime was obtained through an optimized heat treatment in the present work.
Pre-alloyed powder of Ti-22Al-24Nb-0.5Mo (atomic fraction,%) was prepared by gas atomization. Powder metallurgy (PM) Ti_2AlNb alloys were prepared by a hot isostatic pressing (HIPing) route.The influence of experimental variables including HIPing temperatures, solution and aging temperatures on microstructure and properties of PM Ti 2 AlNb alloys was studied. The results showed that HIPing temperature affected the porosity distribution and mechanical properties of PM Ti_2AlNb alloys. The microstructure and mechanical properties of the PM Ti_2AlNb alloys changed obviously after various post heat treatments, and a good combination of tensile strength, ductility and rupture lifetime was obtained through an optimized heat treatment in the present work.