We have studied the effect of barothermal processing (BTP) on the properties of samples prepared by sintering mixtures of tungsten carbide and aluminum nickelide powders (92 vol % WC + 8 vol % Ni3Al) in vacuum and hydrogen. X-ray diffraction data indicate that BTP influences the unit-cell parameters of the WC and improves the mechanical properties of the alloy. In particular, it increases its fracture toughness, bending strength, compressive strength, and fracture work. BTP at 1450°C and 150 MPa produces the most significant changes in the properties of the alloy.