The Effect of Yttrium Addition on the Microstructure and Irradiation Hardening in V-4Cr-4Ti Alloy under Self-Ion Irradiation

Microstructure and irradiation hardening of V-4Cr-4Ti alloys with different yttrium (Y) contents were studied by self-ion at 550 °C via TEM nano-indentation test technology. The peak damage the V-4Cr-4Ti-xY alloy (x = 0, 0.1, 0.5, 1, wt.%) irradiated 2.5 MeV (V2+) is 8 dpa. Dense dislocation loops observed in all vanadium samples after irradiation. With increase Y content, both average size number density using g <110> near pole [001] decreased, while hardness increment first decreased then increased. In order to better reduce hardening, it considered that addition 0.1 wt.% reasonable.