(1) Institute for Space Simulation, DLR, 51147 Cologne, Germany
Abstract:
Surface segregation is the key to understanding the surface tension γ of alloys. The basic phenomena can be demonstrated qualitatively
by using the ideal solution model. For a binary system, this model is first used to explain the temperature dependence of
the surface tension. A simple criterion is established for sign reversal of the temperature coefficient. The ideal solution
model is then extended to include the effect of compound formation. A simple explicit equation is proposed which fits existing
data surprisingly well.
Paper presented at the Seventh International Workshop on Subsecond Thermophysics, October 6-8, 2004, Orléans, France.