Experimental study on the dynamic mechanical properties of titanium alloy after thermal oxidation

Abstract

In this study, the dynamic compressive properties of thermally oxidized TC4 (Ti-6Al-4V) titanium alloys were studied with split Hopkinson pressure bar. The dynamic tests were conducted under multiple strain rates from 400 to 2000 s -1 and different testing temperatures from 25 to 200°C. Data for the true stress-strain curves of thermally oxidized TC4 titanium alloy are presented. They show that the thermal oxidation increases both the dynamic compressive strength of TC4 titanium and the rate of strain hardening. Higher compressive strengths of the material were obtained by applying higher strain rates. Under a strain rate of 2000 s -1 , the stress-strain curves of TC4 titanium alloys exhibit both strain-rate-hardening behavior and thermal softening behavior. The oxidation temperature has little effect on dynamic properties of TC4 titanium alloy, but choosing different holding time for oxidation could greatly affect the initiation of plastic deformation and thus might potentially improve the ductility of the treated material. Furthermore, the data show that the increase in the testing temperature results in much lower yield stresses of the treated material.

Formation mechanism and function of tribo-layers in dry sliding wear of TC11 alloy

“…Since the beginning of application of titanium alloys, surface engineering methods such as thermal oxidation, nitriding, laser surface alloying and micro arc oxidation have been widely used to improve the wear resistance of titanium alloys in practical applications [5][6][7][8][9]. In recent years, with the continuous expansion of application field of titanium alloys, many investigations have been carried out on the friction and wear of titanium alloys themselves.…”

Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

“…Up to date, DRX has been recognized as a powerful mechanism for grain refinement under hot plastic deformation. In this context, in-depth understanding of microstructural evolution during DRX can help develop more accurate prediction methods to simulate microstructural characterization and mechanical properties in the hot deformation of metals and alloys [1][2][3].…”