Microstructure and mechanical properties of powder metallurgy Ti–22Al–24Nb–0.5Mo (at.%) alloys

Abstract

The Ti–22Al–24Nb–0.5Mo (atomic fraction, %) pre-alloyed powder was produced by gas atomisation. Powder metallurgy Ti₂AlNb alloys were prepared by a hot isostatic pressing procedure. The influence of experimental variables including hipping temperatures, solution and aging temperatures on microstructure and properties of powder metallurgy Ti₂AlNb alloys was assessed. The experimental results showed that hipping temperature affected the porosity distribution and mechanical properties of powder metallurgy Ti₂AlNb alloys. Good comprehensive mechanical properties (tensile strength, ductility and rupture lifetime) could be obtained through an optimised heat treatment process.

Keywords:

• Pre-alloyed powder
• Ti₂AlNb alloy
• Hot isostatic pressing
• Porosity
• Mechanical properties