One of the most promising structural materials for lead-cooled fast reactors is ferritic Fe- CrAl steel due to the high temperature oxidation resistance, corrosion resistance and also radiation-induced swelling resistance. FeCrAl steels have also shown very good resistance to liquid metal embrittlement but what effect irradiation have on this phenomenon is still not well-known. The use of proton irradiation in nuclear materials science to simulate the damage of neutron irradiation has been widely explained Despite the use of proton irradiation in nuclear materials science to simulate the damage of neutron irradiation on materials has been encouraged by numerous studies, ions have the disadvantages to present a very limited penetration depth resulting in radiation damage limited to the surface layer in standard size FeCrAl samples.