Abstract
One kind of meta-stable β titanium alloy with grain sizes less than 1µm was developed using conventional plastic deformation process in Northwest Institute for Nonferrous Metal Research (NIN). The so called Ti - B 19 alloy ( Ti - Al - Mo - V - Cr - Zr ) possesses excellent strength and toughness. In order to excavate the potential workability of the alloy, isothermal compression tests were carried out on the Gleeble-1500 thermal simulator at the temperature from 750°C to 1000°C and strain rate from 0.001 s-1 to 10s-1. The results indicate that the flow stresses of the alloy will be heavily influenced by the strain rates and deformation temperature. The flow stress decrease with the increase of deformation temperature, and increase with the increment of strain rates. A constitutive equation for the flow stress has been defined and the test conditions for a homogeneous deformation evaluated, and the material constants including activation energy Q , stress exponent n and constant ln ( A ) were also obtained.
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