The Effects of Al, Cr on the Oxidation Behavior of a Ⅴ-4Ti Alloy

Oxidation experiment was performed in air at elevated temperature for three kindsof vanadium alloys. The features of the oxides and the role of the alloying elements were analyzed.All specimens exhibited a parabolic kinetic behavior of weight gain with the exposure time. Thealloys can't be used in air at the temperature over 700℃, below which, V4Ti3A1 showed a muchlower oxidation rate than the V4Cr4Ti alloy. It was found that A1 in the alloy was segregated tothe specimen surface in the process, and formed into Al2O3 on the surface, hence decreasing theformation of V2 Os. The oxides on the surface were nucleated in a small number density and grewto a large size, giving more protection to the matrix alloy.