Steady state creep of in situ TiB plus La2O3 reinforced high temperature titanium matrix composite

TiB and La2O3 reinforced titanium matrix composite is in situ synthesized by common casting and hot working technologies. Steady state creep behaviors of the matrix alloy and the TiB plus La2O3 reinforced composite are investigated in the temperature range 873–973 K. Creep resistance of the composite is significantly enhanced by the reinforcements. Steady state creep behaviors of the matrix alloy and composite are both controlled by dislocation climbing. The refined TiB whiskers La2O3 particles are responsible for the threshold stresses. Creep enhancement of the composite can be mainly attributed to threshold stresses at lower temperatures and stress transfer effects at higher temperatures. A power-law constitutive equation for steady state creep of the composite is built up.