Surface blistering of the amorphous alloys Co,70,.,2,Fe,3,.,9,Nb,3,.,9,Si,14,B,8, and Co,66,Fe,4.5,V,2.25,Ni,2.25,Si,10,B,15, due to argon ion bombardment at energies of 150, 195 and 300 keV has been observed with a scanning electron microscope (SEM). The critical dose for onset of blistering and the blister diameter are determined and found to increase with increasing projectile energy. Above about 195 keV, blisters and rupture of blisters are the predominant surface damage phenomena. However, at 150 keV, there is no evidence of cracked blisters. The effects are interpreted in terms of argon agglomeration, building-up of the critical argon pressure, and argon releasing from near-surface regions.