A study on the recrystallization behavior of Zr-Nb binary alloys

摘要

Effect of niobium content on the recrystallizationbehavior of binary Zr-Nb alloys were studied. The specimens with0.2, 0.4, 0.8 and 1.0 wt.% of niobium were prepared under variousannealing temperatures from 300℃ to 800℃ and times from300 to 5000 minutes after vacuum arc remelting. Therecrystallization behavior was observed by a polarized opticalmicroscope, TEM and micro-vickers hardness tester. Therecrystallization temperature of the alloys slightly increased withniobium content due to increase of activation energy. The graingrowth of the alloys with 0.2 and 0.4 wt.% of niobium occuredrapidly, however, that of the alloys with 0.8 and 1.0 wt.% niobiumwere gradually retarded due to precipitation. The hardness of thealloy with a high niobium slightly increased by the precipitation ofbeta phase after annealing at 800℃.