Thermophysical properties of undercooled liquid Co-Mo alloys
- 1 January 2003
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 83 (13), 1511-1532
- https://doi.org/10.1080/1478643031000090284
Abstract
Using electromagnetic levitation in combination with the oscillating drop technique and drop calorimeter method, the surface tensions and specific heats of undercooled liquid Co-10 wt% Mo, Co-26.3 wt% Mo, and Co-37.6 wt% Mo alloys were measured. The containerless state during levitation produces substantial undercoolings up to 223 K (0.13 T L), 213 K (0.13 T L) and 110 K (0.07 T L) respectively for these three alloys. In their respective undercooling ranges, the surface tensions were determined to be 1895 m0.31(T m1744), 1932 m0.33(T m1682), and 1989 m0.34(T m1607) mN m−1. According to the Butler equation, the surface tensions of these three Co-Mo alloys were also calculated, and the results agree well with the experimental data. The specific heats of these three alloys are determined to be 41.85, 43.75 and 44.92 J mol−1 K−1. Based on the determined surface tensions and specific heats, the changes in thermodynamics functions such as enthalpy, entropy and Gibbs free energy are predicted. Furthermore, the crystal nucleation, dendrite growth and Marangoni convection of undercooled Co-Mo alloys are investigated in the light of these measured thermophysical properties.Keywords
This publication has 32 references indexed in Scilit:
- Float zone growth and characterization of Ge1−xSix (x⩽10at%) single crystalsJournal of Crystal Growth, 2001
- Thermodynamic assessment of the Co-Mo systemJournal of Phase Equilibria and Diffusion, 1999
- Surface Tension of Liquid Metals: Results from Measurements on Ground and in SpacePhysical Review Letters, 1995
- On the relation between surface tension and viscosity for liquid metalsScripta Metallurgica et Materialia, 1993
- Measurement of the enthalpy and specific heat of undercooled nickel and iron meltsJournal of Non-Crystalline Solids, 1993
- Oscillations of magnetically levitated aspherical dropletsJournal of Fluid Mechanics, 1991
- Thermodynamic aspects of metastable-phase formationPhilosophical Magazine Part B, 1990
- Thermodynamics of liquid alloys and glass formationPhilosophical Magazine Part B, 1987
- On the free energy change accompanying crystallisation of undercooled meltsActa Metallurgica, 1984
- The thermodynamics of the surfaces of solutionsProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1932