Effect of Hot Isostatic Pressing and Heat Treatment on Microstructure and Mechanical Properties of Pm Ti‐22Al‐24Nb‐0.5Mo (At.%) Alloy

Abstract

Ti-22Al-24Nb-0.5Mo (at.%) pre-alloyed powder was prepared by the electrode induction melting gas atomization (EIGA) process. Powder metallurgical (PM) alloy was prepared by hot isostatic pressing (HIP'ing). HIP'ing with different parameters and different post heat treatments were conducted to study their effects on microstructure and mechanical properties of the PM alloy. The microstructure was characterized by optical microscopy, scanning electron microscopy, X-ray Micro Computed Tomography (Micro-CT) and so on. Porosity distribution in the HIP'ed samples, directly influenced by HIP'ing temperature was related to their mechanical properties. The variation of the amount of different phases and the microstructure with post heat treatment was studied in detail, and a good combination of tensile strength, ductility and stress rupture life were obtained through an optimized heat treatment.