A REVIEW OF MIXING PROCESSES IN TA FE AND MO/FE SYSTEMS TREATED BY HIGH-CURRENT ELECTRON-BEAMS/

The review deals with a brief analysis of results on mixing in Ta/Fe a nd Mo/Fe systems using high current electron beams. Theoretical models of mass-transfer, which the authors used for the interpretation of ex perimental results obtained after pulsed beam treatment, have been con sidered. The formation of amorphous phase, intermetalloid phases Fe2Ta , as well as the formation of high dislocation density up to 5 x 10(10 ) cm(-2) have been shown. A non-equilibrium metastable phase Fe4Mo(Fe8 0Mo20) and, possibly Fe96Mo4, is formed as a result of irradiation of Mo/Fe system. The formation of a surface complex structure and near su rface layers result in an enhancement of corrosion resistance, an incr eased depth of the hardened layer and a higher resistance to brittle d amaging. (C) 1998 Elsevier Science B.V. All rights reserved.