Comparative Study of the Microstructure and Tensile Properties of Ni-Al Alloys with Fe and Cr Additions

Abstract

ABSTRACTThe tensile behaviour of Ni-32at.% Al-5at.% Fe and Ni-32at.% Al-12 at.% Cr two-phase intermetallic compounds has been studied in the 20–750°C temperature range. TEM studies of the defect structures have been performed. Both alloys exhibit a brittle behaviour at room temperature, while at high temperature the Ni-Al-Cr alloy appears to be much more ductile that the Ni-Al-Fe alloy. Various reasons for the limited ductility and the brittle-to-ductile transition in these alloys are discussed.