Fabrication of nickel–aluminum alloys with tungsten and molybdenum borides by the method of self-propagating high-temperature synthesis

Abstract

Intermetallic alloys in the Ni–Al system strengthened through inclusions of molybdenum and tungsten borides by means of sequential exothermic reactions in a two-layer charge are fabricated. NiAl and Ni₂Al₃ intermetallic phases and molybdenum (Mo₂B₅) and tungsten (W₂B₅) borides are identified in alloys by the methods of X-ray diffraction and elemental analysis. It is established that Mo₂B₅ and W₂B₅ inclusions are characterized by high values of microhardness (Mo₂B₅—24.4 GPa and W₂B₅—29.2 GPa).