Al–Co–W fusion diagram in the Co–CoAl–W part
Chem.
Met. Alloys 1
(2008) 338-342
https://doi.org/10.30970/cma1.0073
G. DMITRIEVA, V. VASILENKO,
I. MELNIK
The fusion diagram of the Al–Co–W system in the
Co–CoAl–W part was drawn using optical light, differential thermal,
X-ray diffraction and electron microprobe analysis data. The alloys were
prepared by arc melting. No ternary intermediate phase was found in
this
partial system above 900°C.
The phase equilibria between CoAl
and W were established
with the peritectic reaction L+W↔CoAl at 1650ºC. The Co–CoAl–W fusion diagram has two isothermal three-phase fields
corresponding to four-phase invariant reactions with participation of liquid: L↔Co+CoAl+Co7W6 (1380°C) and L+W↔Co7W6+CoAl (1490°C). The solidus
and liquidus surface projections and the vertical sections for 75 at.%
Co and equiatomic Al and W are presented and compared
with the isothermal sections at 1200°C and 900°C reported earlier.
Solidus surface
projection of the Al–Co–W system in the Co–CoAl–W
part.
Keywords
Phase equilibria
/ Solubility / Fusion diagram / Solidus / Liquidus