In spite of the advance in theoretical modelling of surfaces, there ar
e a Limited number of investigations on the characteristics of multico
mponent alloy surfaces. Moreover, the corresponding experimental work
does not compare in scope and depth with the work done on binary alloy
surfaces. Recent developments in computational modelling using semiem
pirical methods both in the fields of alloy design as well as surface
analysis: hint to the possibility of exploiting the predictive power o
f these methods towards a comprehensive analysis of multicomponent all
oy surfaces. In this work, we apply the BFS (Bozzolo-Ferrante-Smith) m
ethod for alloys to determine the essential features of multicomponent
alloy surfaces. Several issues will be illustrated, ranging from the
influence of ternary additions to the surface composition of (110) sur
faces of binary alloys (Ti or Cr additions to NiAl), the composition a
nd energetics of ternary (Ni-Al-Cr and Ni-Al-Ti alloys) alloy surfaces
and quaternary (Ni-Al-Ti-Cr and Ni-Al-Ti-Cu) alloy surfaces.