Abstract
The phase transformation of Ti–20Zr–6.5Al–4V alloy was studied during different heat treatment processes. Due to the addition of zirconium possessing the high-stacking-fault energy, a small amount of Ti underwent allotropic transformation from hcp-Ti to face-centered cubic (fcc) Ti during heat treatment. The alloy, which was subjected to solid solution treatment at 950°C for 60min and subsequent water quenched, underwent the following phase transformations: β→α+β (residual)+α″+fcc phase. The fcc phase was also found in the subsequent aging process, and when aging temperature reached 700°C, the fcc-Ti completely decomposed into hexagonal close-packed α phase. The transus temperature of fcc-Ti was between 650°C and 700°C. It was found that the mechanical properties of the alloy are remarkably dependent on fcc phase content.
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