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Sumnary The effect of crystallographic orientation on the 70°F to ZOOO'F physical and mechanical properties of , , , and oriented investment cast dendritic single crystal Ni-6.8Al-13.8Mo-6W alloy has been investigated. As expected for a cubic crystal, the thermal expansion coefficient is invariant with orientation and Young's Modulus is highest in the and lowest in the direction. The 70°F tensile properties of the material are anisotropic, with highest ultimate and yield strength in the orientation and greatest ductility in the orientation; whereas, tensile strength is essentially isotropic at 1800°F and 2000'F. The 1800°F and 2000°F creep-rupture properties of the alloy exhibit significant anisotropic behavior. Rupture life is nine times higher at 1800°F/36 ksi and sixteen times higher at 2OOO"F/20 ksi in the orientation than in the orientation. 1800°F axial strain-controlled low cycle fatigue life correlates well with simple parameters related to Young's Modulus.

The Effect of Crystallographic Orientation on the Physical and Mechanical Properties of an Investment Cast Single Crystal Nickel-Base Superalloy