Abstract
Owing to their high strength-to weight ratio and excellent corrosion resistance, titanium alloys are generally utilized in aerospace industry, chemical engineering, biomaterials, food processing and the condenser material in power plants. Ti-6Al-4V is by far the most important and widely used titanium alloy. The microstructure of Ti-6Al-4V at ambient temperature contains two phases, namely the {alpha} phase with a HCP structure and the {beta} phase with a BCC structure. The distribution and relative amount of the two phases may be altered by heat treatment and thereby changing their mechanical properties. It is well known that titanium alloys are very susceptible to hydrogen embrittlement and hydrogen-induced subcritical crack growth (SCG). Since titanium alloys are mostly used as structure material and the hydrogen embrittlement of the component may cause catastrophic accident, it is important to understand the effect of hydrogen on the crack growth behavior of titanium alloys.
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