Abstract The effect of hydrogen charging on the microstructure (α+β)/βtransformation and the mechanical properties of Ti-60 alloy at high temperature have been investigated. The results show that the volume fraction of primaryαand the (α+β)/βtransformation temperature is continuously decreased with increasing hydrogen contents. The result also indicate that the yield strength at high temperature is also continuously decreased with hydrogen concentration, and the minimum yield strength occurs at a concentration which corresponds to the (α+β)/βtransition and that further increase in yield strength is due to the hardening effect of hydrogen addition in the βphase.
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