Effect of alloying additions of Aluminium and Iron on the creep resistance of Ti-12Cr (wt.%)

Titanium and its alloys are among the highly desired metallic materials for biomaterial, marine, and aerospace applications due to their excellent properties. Beta titanium alloys with the omega phase usually tend to exhibit superior strengths and hardnesses. In this study, the creep properties of three different beta titanium alloys (Ti-13.0Cr-1.0Fe-3.0Al(wt.%), Ti-13.0Cr-3.0Al(wt.%), and T-13.0Cr(wt.%)) were experimentally obtained at different loading and temperature conditions and compared. The microstructure-properties relationship was investigated before and after thermomechanical processing. X-ray diffractometer (XRD), optical microscope (OM), and scanning electron microscope (SEM) were used to determine the phases present during creep. After heat treatment for 48 hrs at 410 ºC it was found that the elastic modulus and hardness of alloys went up due to the presence of alpha and omega phases. Ti-13.0Cr-1.0Fe-3.0Al was the most creep resistant followed by Ti-13.0Cr-3.0Al and then T-13.0Cr.