Effect of Tungsten on High Temperature Plasticity of High Temperature Titanium Alloy by TiH₂ Powder Metallurgy

In this paper,titanium hydride（TiH₂） was used as raw material to prepare high-temperature titanium alloys by powder metallurgy.The effect of tungsten content on high temperature plasticity of the prepared Ti alloy was explored at deformation temperature of 750～900 ℃,deformation amount of 50%,and strain rate of 0.1 s^-1 and 1 s^-1.The results show that the overall structure of the alloy after high-temperature compression is similar to the mesh basket structure with the layer spacing of α phase significantly reduced,and the grain is refined.When the strain rate is low(0.1 s^-1),tungsten can increase the flow stress of the alloy.At the tungsten content of 0.5%,the maximum flow stress of the alloy is 423.1 MPa.When the strain rate is higher(1 s^-1),the flow stress increases first and then decreases as the tungsten content increases.At the tungsten content of 0.5%,the maximum alloy flow stress is 505 MPa.