Viscosities of Fe Ni, Fe Co and Ni Co binary melts
Abstract
Viscosities of three binary molten alloys consisting of the iron group elements, Fe, Ni and Co, have been measured by using an oscillating cup viscometer over the entire composition range from liquidus temperatures up to 1600 °C with high precision and excellent reproducibility. The viscosities measured showed good Arrhenius linearity for all the compositions. The viscosities of Fe, Ni and Co as a function of temperature are as follows: \eqalign{
& \log \eta={-}0.6074 + 2493/T\qquad for\quad Fe\\ & \log \eta={-}0.5695 + 2157/T\qquad for\quad Ni \\ & \log \eta={-}0.6620 + 2430/T\qquad for\quad Co.} The isothermal viscosities of Fe-Ni and Fe-Co binary melts increase monotonically with increasing Fe content. On the other hand, in Ni-Co binary melt, the isothermal viscosity decreases slightly and then increases with increasing Co. The activation energy of Fe-Co binary melt increased slightly on mixing, and those of Fe-Ni and Ni-Co melts decreased monotonically with increasing Ni content. The above behaviour is discussed based on the thermodynamic properties of the alloys.- Publication:
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Measurement Science and Technology
- Pub Date:
- February 2005
- DOI:
- 10.1088/0957-0233/16/2/006
- Bibcode:
- 2005MeScT..16..363S
- Keywords:
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- viscosities of Fe–Ni Fe–Co and Ni–Co binary melts