Role of Hydrogen and Alloying Elements in Titanium Hydride Based BEPM of Titanium Alloys

摘要

The blended elemental powder metallurgy (BEPM) approach based on titanium hydride powder generally results in a better balance of the mechanical properties of the processed alloys in comparison to the properties of the alloys processed with common titanium powder. In this paper, the influence of hydrogen and various alloying elements on sintering behavior of the blends of titanium hydride and master alloys is analyzed. The final microstructure results from the competitive development of chemical homogenization, healing of porosity,and grain growth, which demonstrates specific features for each combination of the alloying elements. Experimental results were used to optimize the processing parameters for the CP-Ti and three alloys (Ti-6Al4V,Ti-5Al-5V-5Mo-3Cr, Ti-10V-2Fe-3Al) so as to reach a desirable combination of homogeneous finegrained microstructure and high relative density (low porosity) and,hence,a high balance of their mechanical properties