Abstract
Hydrogen absorption and desorption treatment consists of two processes for near α-phase Ti-55 titanium alloy: (1) hydrogenation with different contents and (2) hydrogen desorption by vacuum annealing at 700 °C and with pressure less than 10−4Pa for 2 h. Equiaxed ultrafine-grained structure with a grain size range between 0.5 and 1 μm has been obtained. Compared with as-received alloy, the grain size of fully dehydrogenated specimen is reduced by ten times. The grain refinement mainly results from αH ↔ βH transformation and accompanied recrystallization. The optimum superplastic temperature of Ti-55 alloy is reduced by about 150 °C, which arises from more grain boundary area and higher proportion of extremely deformable β phase in the ultrafine-grained alloy.
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