ION-IMPLANTATION DAMAGE PRODUCED BY 100 KEV AR+ IONS IN FE-40 AT-PERCENT AL AND FE-CO-2V ORDERED ALLOYS

The damage produced by room temperature 100 kev Ar** plus ion bombardment of two ordered alloys Fe-40 at. % Al and Fe-48 at. % Co-2 at. % V has been investigated by transmission electron microscopy. In the Fe-40 at. % Al alloy, the high stability of the ordered phase is confirmed for doses up to about 2 multiplied by 10**1**6 ions/cm**2 (approximately 38 dpa). In contrast, in the Fe-Co-2V alloy, after an increase in size and density of the damaged regions a significant decrease in the long range degree of order occurs at a fluence of about 10**1**5 ions/cm**2, followed by complete disordering at 10**1**6 ions/cm**2. During post-irradiation annealing experiments, the evolution and recovery of the damage does not occur significantly before 700 K.