On the Ductility of the Intermetallic Compound Ni3Al

Aoki K., Izumi O.

doi:10.2320/matertrans1960.19.203

Compressive and tensile tests were performed using both single and polycrystal specimens of an intermetallic compound Ni₃Al which is usually believed to be brittle, and especially the ductility was examined by comparing the elongation of specimens with fracture surface observations. Main results obtained are summarized as follows. (1) Polycrystalline specimens homogenized after casting do not show any elongation by tension at every temperature, and the fracture surfaces exhibit an intergranular fracture mode. On the other hand, compressive plastic deformation is possible to some extent, though intergranular fracture is also accompanied. (2) Single crystal specimens show about 100% elongation at and below room temperature. At higher temperatures, the elongations markedly decrease with increasing temperature and attain minimum values at the peak temperature of yield stress. Fracture modes are all ductile ones, showing a dimple pattern observable at a large magnification. (3) Polycrystal specimens, which were obtained by recrystallization annealing of the cold rolled single crystals, show about 15% elongation even at room temperature. Fractography shows transgranular as well as intergranular fracture. Thus, the lack of ductility in Ni₃Al polycrystals seems to be caused mainly by segregation of impurity atoms to the grain boundary.

On the Ductility of the Intermetallic Compound Ni<SUB>3</SUB>Al

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