Alloying behaviour of molten Ni–Pt and Al–Ge alloys

Abstract

We have used Flory's model to compute free energy of mixing (G _M), concentration fluctuation in long-wavelength limit (S _CC(0)), Warren–Cowely short-range order parameter () and ratio of mutual and intrinsic-diffusion coefficients (D _M/D _id) for Ni–Pt liquid alloy at 1625 K and Al–Ge alloy at 1200 K. All of these computed parameters have been found to be in a very good agreement with observed values for both of these alloys. The analysis suggests that Ni–Pt alloy in the liquid state is a strongly interacting system while Al–Ge alloy in the liquid state is a moderately interacting system. Both of the alloys are found to be heterocoordinating systems.

Keywords:

• Flory's model
• free energy of mixing
• diffusion coefficients
• heterocoordinating system

Acknowledgements

The author is grateful to Dr B.P. Singh (University Department of Physics, T.M. Bhaglpur University, Bhagalpur, India) and Dr I.S. Jha (Post-Graduate Department of Physics, M.M.A.M. Campus, Biratnagar, Nepal) for their fruitful suggestions.