The effects of non-stoichiometry and titanium additions on the mechanical behaviour of Ni3Al (γ′)

Abstract

The influence of deviations from stoichiometry and titanium additions on the flow stress of polycrystalline Ni3Al has been determined in the temperature range — 196 to 1000 °C. The flow stress is found to be sensitive to small composition changes within the phase field. In particular, aluminium-rich deviations from stoichiometry produce significant strengthening in the compound. Titanium additions also result in strengthening but at the same time shift the peak in the flow stress—temperature curve to lower temperatures.