Effects of graphene oxide on microstructure and mechanical properties of 600℃ high temperature titanium alloy

Abstract

The 600℃ high temperature titanium alloy composite with graphene oxide addition was prepared by temperature-controlled mixing method and hot isostatic pressing. Microstructure and mechanical properties of composite were studied by metallographic observation, energy spectrum analysis, phase analysis and tensile test. The results show that graphene oxides are dispersed uniformly in the 600℃ high temperature titanium alloy powder when the content of graphene oxide is 0.3%(mass fraction) and the main mode of action is physical adsorption. Compared with the alloy without graphene oxide, the microstructure of the composite with 0.3% graphene oxide is obviously refined, and the average size of equiaxed alpha phase is reduced by 36%. Meanwhile, the average room temperature tensile strength and yield strength increase by 7.8% and 10.4% respectively and Vickers hardness increases by 25.6%. The strengthening mechanisms of graphene oxide on 600℃ high temperature titanium alloy mainly include grain refinement strengthening,dislocation streng-thening and precipitation strengthening of the (TiZr)6Si3 second-phase.

Keywords

• graphene oxide
• 600℃ high temperature titanium alloy
• composite
• microstructure
• mech-anical property