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通过自行研制开发的新型复合材料半固态连续机械搅拌设备,制备了半固态的B4C/Y112复合材料浆料,研究了外加增强颗粒B4C的预热处理、颗粒尺寸和质量分数对半固态固相组织的变化规律,并对制备的含不同质量分数B4C颗粒(颗粒尺寸5～7μm)的复合材料进行拉伸、硬度等力学性能测试。结果表明:B4C颗粒经预热处理,颗粒尺寸越大,质量分数越大,固相颗粒越细小、均匀、圆整。加入经过400℃预热处理2h、颗粒尺寸5～7μm和质量分数为6%的B4C颗粒制备的半固态固相颗粒细小、均匀、圆整。半固态铝基复合材料的硬度随着加入B4C颗粒的质量分数增加而不断增大,12wt.%～B4C/Y112复合材料硬度值最高,达到136HV;其抗拉强度随着B4C含量的增加呈先上升后下降趋势。
The semisolid B4C / Y112 composite slurry was prepared by a new type of composite semi-solid continuous mechanical stirring equipment developed by ourselves. The effects of pre-heat treatment, particle size and mass fraction on the semi-solid phase structure The mechanical properties of the prepared composites with different mass fraction of B4C particles (particle size of 5 ~ 7μm) were tested by tensile test and hardness test. The results show that: B4C particles preheated, the larger the particle size, the greater the mass fraction, the smaller solid particles, uniform, rounded. The semi-solid particles prepared by adding B4C particles preheated at 400 ℃ for 2h, the particle size of 5 ~ 7μm and the mass fraction of 6% were fine, uniform and round. The hardness of semi-solid aluminum matrix composites increases with the mass fraction of B4C particles added, and the hardness of 12wt.% ~ B4C / Y112 composite reaches the highest at 136HV. The tensile strength increases with the increase of B4C content Rising downward trend.