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The distribution of grain boundary types along intergranular cracks in B-free Ni3Al and pure Ir was measured, by C value, and compared to the distribution in the bulk, using statistically significant sample sizes. It was found that low angle (Cl) and symmetrical X3 boundaries (twins) are particularly strong. All other high boundaries have similarly low strength, independent of their C values, in particular, low C, high angle boundaries, as a group, are not strong. These results qualitatively agree with predictions based on the structural unit model and imply that 1) Ni3Al and Ir have similar boundary structure and 2) the fracture strength of an intergranularly brittle polycrystalline aggregate can be increased only by increasing the fraction of low angle and symmetrical C3 boundaries.

Grain Boundary Geometry and Intergranular Crack Propagation in Ni<sub>3</sub>Al and Ir