Investigation to Develop a High Strength Eutectic for Aircraft Engine Use.

摘要

Properties of the Ni3Al-Ni3Cb eutectic composite which may be important to its application in a gas turbine environment were evaluated. Plane-front,directional solidification of this alloy system may be accomplished in high purity alumina investment molds provided the temperature and duration of liquid metal contact are minimized. A hypoeutectic alloy composite containing a higher volume percent of gamma'has been successfully prepared and shown to possess increased longitudinal ductility while retaining the outstanding strengths of the eutectic. This alloy is also shown to be more oxidation resistant than the pseudo-binary eutectic. A coating system which offers protection from the high temperature corrosion of a gas turbine environment was developed for the eutectic. (Author)