Abstract
The phase diagrams of the Ni-Mo-B and Ni-W-B ternary systems in the region of less than 50mol%B were constructed by thermodynamic calculation, based on the data obtained by thermodynamic measurement of the related materials. We found three ternary eutectic points and three or two ternary peritecto-eutectic points as follows:
E1:L (1365K, 71.5mol%Ni-6.0mol%Mo-22.5mol%B)=(Ni)+Ni3B+NiMo2B2
E2:L (1355K, 62.5mol%Ni-2.5mol%Mo-30.5mol%B)=Ni3B+Ni2B+NiMo2B2
E3:L (1445K, 42.0mol%Ni-30.6mol%Mo-10.3mol%B)=(Ni)+NiMo+NiMo2B2
P1:L (1812K, 34.9mol%Ni-42.3mol%Mo-22.8mol%B)+MoB=Mo2B+NiMo2B2
P2:L (1633K, 42.3mol%Ni-40.4mol%Mo-17.3mol%B)+Mo=Mo2B+NiMo2B2
P3:L (1812K, 53.5mol%Ni-33.7mol%Mo-12.8mol%B)+Mo=NiMo+NiMo2B2
E1:L (1622K, 51.0mol%Ni-31.6mol%W-17.4mol%B)=(Ni)+W+NiW2B2
E2:L (1260K, 71.0mol%Ni-7.0mol%W-22.0mol%B)=(Ni)+Ni3B+NiW2B2
E3:L (1291K, 65.4mol%Ni-4.8mol%W-29.8mol%B)=Ni2B+Ni3B+NiW2B2
P1:L (2115K, 23.8mol%Ni-43.1mol%W-33.1mol%B)+WB=W2B+NiW2B2
P2:L (1657K, 48.9mol%Ni-33.1mol%W-18.0mol%B)+W2B=W+NiW2B2
The calculated phase diagrams are expected to be useful for the development of new Ni-based heat-, corrosion- or wear-resistance alloys.
