The mechanical strength of Zircaloy-4 increased with the formation of the ODS layer. The ring-tensile strength of Zircaloy-4 increased from 790 to 870 MPa at room temperature, from 500 to 575 MPa at 380 C, and from 385 to 470 MPa at 500 C. Strengthening became more effective as the test temperature increased. It was noted that brittle fracture occurred at room temperature, which was not observed at elevated temperatures. | Effect of a surface oxide-dispersion-strengthened layer on mechanical strength of zircaloy-4 tubes
