Studies of grain boundaries may be helpful in understanding the brittl
eness of the B2 ordered alloy FeAl. To this end, an interatonic potent
ial is proposed, lying on a modified Embedded-Atom Method. This method
, rather similar to that used for semiconductors, involves a 3-body no
n central term in the energy, making it possible to describe the stron
gly directional effects in FeAl. A great number of zero temperature bu
lk and defect properties are correctly reproduced for Fe and Al as wel
l as for the alloy, indicating that the potential is probably a good t
ool for molecular statics simulations. As a first application, the str
ucture of the Sigma 5 [100] 37 degrees tilt grain boundary is determin
ed.