Abstract
With boron-doped NiAl alloys, the solubility of boron, the composition and structure of the precipitated boride and the change in fracture mode due to boron addition have been studied. The solubility of boron is very small on the Ni-rich side of the alloys with a slight increase in its magnitude with deviation from the stoichiometric composition of the alloys, while the solubility of boron on the Al-rich side can be neglected. The structure of the precipitated boride on the Ni-rich side of the NiAl(45 at%Al) alloy is a Cr23C6 type compound, where composition is Ni60Al10B30 and the lattice parameter of which is 1.0542 nm.The fracture mode for the alloys changes from the intergranular to the transgranular type of fracture as an increase in boron concentration for both sides of Ni- and Al-rich compositions. However, the critical concentration of boron to the mode change in fracture mode is 0.003 mass% on the Ni-rich side, whereas it is 0.02 mass% on the Al-rich side.
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