A review is given on the results of magnetic, transport and Mossbauer
effect studies performed on two systems UFe1-NixAl and UFe1-xCoxAl. In
addition, chemical bonding, based on the distribution of electron den
sities in the unit cell of these systems, will be discussed. It appear
s that the latter is mostly responsible for the anomalous behavior of
the lattice parameters and the magnetic as well as hyperfine propertie
s observed in these alloys.