Effect of neutron irradiation on mechanical properties of Cu-Alloy/SS316 joints

The effects of neutron irradiation on tensile properties of the Cu alloys t o type 316 stainless steel (SS316LN-IG) joints fabricated by friction weldi ng method were examined. Additionally, irradiation tests of Al2O3-dispersed copper alloy (A1-25) and SS316LN-IG were conducted. The A1-25/ SS316LN-IG joints were irradiated in the Japan Materials Testing Reactor (JMTR), and t ension tests and metallographical observation of these joints have been per formed as the post irradiation examination (PIE). In the tension tests of A 1-25/ SS316LN-IG joints, all irradiated specimens fractured at the copper s ides. In the tension tests at 293K, tensile strength of the A1-25/ SS316LN- IG joints irradiated at each temperature was almost similar to that of the base metal (A1-25) irradiated in the same condition. On the other hand, ten sile strength of A1-25/ SS316LN-IG joints was smaller than that of A1-25 in the tension tests at the same temperature as each irradiation temperature. In this study, useful data of the irradiated A1-25/ SS316LN-IG joints fabr icated by friction welding method were obtained to design fusion reactors.