Abstract
Our earlier works have shown that the better corrosion resistance of Ti-6Al-4V alloy can be achieved by applying a post-THP annealing treatment associated with a controlled oxidation reaction which can produce finer oxide particles and almost seal the oxygen diffusion paths leading to the formation of a much thinner (0.56 μm), but denser oxide layer than has been indicated in the literature [1,2]. This study aims to investigate the effect of common industrial heat treatments on the mechanical properties and corrosion resistance of Ti-6Al-4V alloy following thermal hydrogenation processing (THP) plus related heat treatments under variant hydrogen loadings. The correlation among the microstructural characteristics in matrix, the oxide layer structure on the surface, and the corresponding properties of the samples after related treatments was analyzed. The phase transformation, microstructural evolution, the formation of intermetallic compounds, oxide layer and the possible mechanism of grain refinement into nano-size scale were also discussed by using HRTEM under variant hydrogen loadings. Keywords：Ti-6Al-4V alloy, Thermal hydrogenation processing, Heat treatment, Microstructure, Oxide layer, , Corrosion resistance, HRTEM.
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