不同化学计量碳化钛的离子辐照损伤行为研究OA

Gen IV nuclear reactors operate in extreme service environments characterized by high temperature and intense irradiation,imposing stringent demands on structural materials and thus necessitating the development of novel irradiation resistant materials.Titanium carbide(TiCx)ceramic is considered as promising structural material for advanced nuclear reactors,attributed to its high melting point,excellent mechanical properties,and excellent corrosion resistance.In this study,TiCx films with different stoichiometries were irradiated with 3 MeV Au2+,aiming to systematically investigate irradiation-induced changes in structural characteristics,surface morphology and mechanical properties under different irradiation fluences.The results revealed that structural disorder of TiCx intensified with increasing irradiation fluence,while the substoichiometric TiCx maintained superior structural stability after irradiation.Surface roughness of substoichiometric TiCx showed no significant variation after irradiation,with no irradiation-induced crack.Additionally,both hardness and elastic modulus of TiCx exhibited an increasing trend after irradiation,demonstrating that substoichiometric TiCx enhanced resistance to irradiation compared to near-stoichiometric counterparts.The native carbon vacancies in substoichiometric TiCx effectively suppress accumulation of irradiation-induced defects,thereby preserving excellent stability.This study provides critical insights into the relationship between stoichiometry and irradiation damage in TiCx,while offering valuable guidance for designing new classes of irradiation-resistant ceramic materials.