Effect of in situ TiB 2 particle reinforcement on the creep resistance of hypoeutectic Al–12Si alloy

Abstract

The effect of in situ TiB 2 particle reinforcement on the tensile creep deformation of an Al–12Si alloy prepared by the technique of salt–metal reactions was studied in a wide temperature range of 573–673 K under a constant stress in air. At the investigated temperature and stress condition, TiB 2 particles significantly increase creep deformation resistance. High values of the apparent stress exponent (∼12) and the apparent activation energy (265 kJ/mol) are observed for creep behavior of the present TiB 2 particle containing Al–12Si alloy. The steady state creep rate data are rationalized by using a substructure invariant model together with the existence of a threshold stress. The excellent fit of the data of the substructure invariant model suggests that the creep deformation of the TiB 2 particle containing alloy is controlled by the lattice diffusion in the aluminum alloy matrix while maintaining a constant substructure.