A study of microstructure and mechanical property of a burn-resistant Ti alloy fabricated by HIPping

Abstract A burn-resistant Ti-25V-15Cr-2Al-0.2C alloy was fabricated by hot isostatic pressing (HIPping) from the prealloyed powders under a pressure of 200 MPa and at 900, 950, and 980 °C for 2 h. Microstructure was examined using scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD) detector and transmission electron microscope (TEM). Tensile tests were to evaluate mechanical behavior of the HIPped samples. The results show that HIPping temperature clearly affects the microstructure of the HIPped samples, thus the mechanical properties. For example, lower HIPping temperature produced more porosities at triple-junctions and more large grains resulted from the original powders, thus lower ductility was observed in the sample HIPped at 900 °C. However, the sample HIPped at 980 °C generates the best tensile properties with over 20% ductility, which is even better than those of as-extruded Ti-25V-15Cr-2Al-0.2C alloy.