Strengthening and void formation in Mo-Zr-B alloy during high temperature neutrons irradiation

Investigated was the influence of the neutron irradiation at 780-1080 deg C with neutron fluences of (1.3-1.8)x1021 n/sm2 (E > 0.1 MeV) on the short-term stress-strain properties, structure and vacancy porosity of Mo-Zr-B dilute alloy. Samples were irradiated in the Sm-2 reactor. The results have shown that the irradiation of the Mo-Zr-B alloys leads to its strengthening, plasticity reduction and growth of the ductile-to-brittle temperature. Shown is a good correlation between the calculated and experimental values of the yield strength growth and the vacancy pore size and density. The anomalous temperature dependence of the swelling has been found out as well as the tendency for changing the shape of pores and stacking fauls within the 950-1080 deg temperature range