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

摘要

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 Ni_2Al_3 intermetallic phases and molybdenum (Mo_2B_5) and tungsten (W_2B_5) borides are identified in alloys by the methods of X-ray diffraction and elemental analysis. It is established that Mo_2B_5 and W_2B_5 inclusions are characterized by high values of microhardness (Mo_2B_5—24.4 GPa and W_2B_5—29.2 GPa).