Effect of swaging on the 1000?C compressive slow plastic flow characteristics of the directionally solidified eutectic alloy ?/?'?-?

Abstract

Swaging between 750 and 1050‡ C has been investigated as a means to introduce work into the directionally solidified eutectic alloy γ/gg′-α (Ni-32.3 wt % Mo-6.3 wt % Al) and increase the elevated temperature creep strength. The 1000‡ C slow plastic compressive flow stress-strain rate properties in air of as-grown, annealed, and worked nominally 10 and 25% materials have been determined. Swaging did not improve the slow plastic behaviour. In fact large reductions tended to degrade the strength and produced a change in the deformation mechanism from uniform flow to one involving intense slip band formation. Comparison of 1000‡ C tensile and compressive strength-strain rate data reveals that deformation is independent of the stress state.