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
.
0
mol%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.
0
mol%Ni-30.
6
mol%Mo-10.3mol%
B
)=(Ni)+NiMo+
NiMo2B2
P
1:L (1812K, 34.9mol%Ni-42.3mol%Mo-
22
.8mol%
B
)+MoB=
Mo2B
+
NiMo2B2
P
2:L (1633K, 42.3mol%Ni-40.
4
mol%Mo-17.3mol%
B
)+Mo=
Mo2B
+
NiMo2B2
P
3:L (1812K, 53.5mol%Ni-33.
7
mol%Mo-12.8mol%
B
)+Mo=NiMo+
NiMo2B2
E1
:L (1622K, 51.
0
mol%Ni-31.
6
mol%W-17.
4
mol%
B
)=(Ni)+W+
NiW2B2
E2
:L (1260K, 71.
0
mol%Ni-
7
.
0
mol%W-
22
.
0
mol%
B
)=(Ni)+
Ni3B
+
NiW2B2
E3
:L (1291K, 65.
4
mol%Ni-
4
.8mol%W-29.8mol%
B
)=
Ni2B
+
Ni3B
+
NiW2B2
P
1:L (2115K, 23.8mol%Ni-43.1mol%W-33.1mol%
B
)+WB=
W2B
+
NiW2B2
P
2:L (1657K, 48.9mol%Ni-33.1mol%W-18.
0
mol%
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.
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