JING Fengting, CHEN Rongchun, ZHANG Yinghui, WANG Hang, SONG Chunmei, WANG Zhigang
The microstructure and hardness of B10 white copper alloy with different Y content (0,0.003 9wt%,0.021wt%,0.053wt%,0.15wt%) after annealing at different temperatures (200-800 ℃) were studied, and the effect of Y on recrystallization behavior was analyzed. The results show that B10 alloy was in the early stage of recrystallization in annealing at 350-650 ℃, and was in the later stage of recrystallization in annealing at 650-800 ℃. In the early stage of recrystallization, Y mainly affected the nucleation of recrystallization. When the content of Y was less than 0.003 9wt%, Y was not conducive to recrystallization nucleation. When the content of Y was more than 0.003 9wt%, Y promoted recrystallization nucleation obviously. At the same temperature, the hardness of the alloy was the highest when the content of Y was 0.003 9wt%, and was the lowest when the content of Y was 0.150 0wt%. In the later stage of recrystallization, Y could suppress the growth of recrystallization grains. The higher content of Y, the more the number of the composite inclusions, the larger the inclusion size, the higher the pinning force acting on grain boundaries, and the finer the grains. At this stage, the hardness decreased sharply with increasing annealing temperature. The hardness of the alloy with 0.15wt% Y was the highest after annealing at 800 ℃, while the hardness of other alloys was basically the same.
