Effect of TiBp particle reinforcement on the creep resistance of near α titanium alloy made by blended elemental powder metallurgy

Abstract

The effect of TiBp particle reinforcement on the primary creep deformation behavior of near α titanium alloy made by blended elemental powder metallurgy was investigated at creep test conditions from 550 to 675 °C under a constant stress of 100–300 MPa in air. The effect of TiBp particles on the creep resistance is found to be dependent on the test condition. At the lower temperature and high stress condition of 550–600 °C and 300 MPa, TiBp particles significantly increase creep deformation resistance and also give rise to a strong retardation effect on the dislocation movement during primary creep deformation. However, the TiBp particles have little effect at the higher temperature and lower stress condition of 675–600 °C and 150 MPa. It is thought that the controlling process of the creep deformation of TiBp particle containing alloy seems to be identical with the matrix alloy at these test conditions. It is also observed that TiBp significantly enhances the creep life under all test conditions.