Study of the radiation damage effect on Titanium metastable beta alloy by high intensity proton beam

•A metastable β Titanium alloy Ti-15V-3Cr-3Sn-3Al irradiated with 30 GeV protons to about 0.1 dpa was studied to evaluate radiation damage effects for high-intensity proton accelerator beam window and target application.•A high density nanometer-sized precipitate was observed by TEM, which would be martensite α and athermal ω formed during the solution-treatment process. They did not appear to change substantially after irradiation with protons.•No obvious signature of radiation damage, such as dislocation loops along the proton beam profile or radiation-induced hardening, was identified.•The metastable β alloy may exhibit radiation damage resistance due to the existence of nano-scale precipitates, acting as sinks for radiation-induced point defects.