Influence of Phase Transformation on the Microstructure of Welding Between Ti and TiAl6V4 Alloy

Titanium and titanium alloys are widely applied in many different industries because of their strength, good corrosion resistance, and especially high heat resistance. However, titanium and its alloys are difficult alloys to weld; after welding, the structure and mechanical properties of the alloy change greatly; affected the mechanical properties of the weld. In this study, the results are presented on the influence of the aging process on the microstructure and mechanical properties of the titanium and TiAl6V4 alloy welds. The micro-hardness distribution line of the weld after uniform heat treatment. After quenching and aging, the alloy's hardness is about 500HV. To the results of microstructure, after heat treatment and aging, the structure of the alloy in the welding zone is the α-phases; the widmanstatten structure, and β’ phase which have the form of stacked slabs. By the structure of welding, there are shown the appearance of bundles of β-type structures interspersed with α-phases.