[3N01-07] Structural Materials for Blankets

[3N02] Characterization of ion irradiatiated interface in Ti-clad V-4Cr-4Ti composite material

*RAN RAN LI¹, Hideo Watanabe¹ (1. KYUSHU UNIVERSITY)

Keywords:V-4Cr-4Ti/Ti, Interface of heterogeneous materials, Precipitates, Ion irradiation

The evolutions of the hardness, irradiation defects and microstructure of the Ti-clad V-4Cr-4Ti composite material after ion implantation were studied. The nanoindentation results show that radiation hardening occurs in all regions during irradiation. The radiation hardening in the interface is lower than in the V-4Cr-4Ti and Ti matrix. Thus, the interface of heterogeneous material exhibits fine resistance to radiation hardening. The experimental values of hardness are much higher than the values calculated by the dispersed barrier hardening model. The TEM results show that the irradiation defects in the interface are low in density, large in size, and uniform in distribution. As a contrast, high density, small size and twisted dislocation loops are observed in irradiated V-4Cr-4Ti and Ti matrix.