Abstract
In two-phase α + β titanium alloys, the phase ration and consequently the phase sizes vary with temperature. The flow stress of this type of alloy is not only affected by the thermal contribution of temperature but also by changes in the phase ratio and sizes. This prompted us to develop a constitutive equation in a superplastic titanium alloy (Ti6.3Al2.7Mo1.7Zr), incorporating volume fraction and phase sizes. The phase ratio was altered at constant temperature by means of charging with hydrogen. The constants of the constitutive equation were evaluated. Flow stresses were then predicted at the optimum superplastic temperature of 1073 K and strain rates of 1.9 × 10 −3 s −1 and 7.1 × 10 −4 s −1 for various β volume fractions. The predicted flow stresses were found to correlate fairly well with the experimentally determined values.
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