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采用深过冷及深过冷加水淬的方法 ,成功地制备了样品直径为 16mm ,高为 15mm ,组织中晶粒平均尺寸小于 12 0nm的Fe76B12 Si12 合金块体纳米材料 .理论分析与实际计算结果表明 :该合金凝固组织纳米化的主要原因在于 ,其共晶两相的生长速度小、组织粗化速率小、溶质平衡分配系数低以及具有相对较低的熔化焓 ;深过冷Fe -B -Si合金块体纳米软磁材料制备的理想条件是 :获得超过冷、选择主要由溶质扩散控制生长的共晶合金成分、获得Fe2 B(Si)相为完全准球状形态的二次粒化非规则共晶组织
The Fe76B12 Si12 alloy bulk nanomaterials with a sample diameter of 16mm, a height of 15mm and an average grain size of less than 120nm in the microstructure were successfully prepared by deep subcooling and deep subcooling plus water quenching. The theoretical analysis and the actual calculation results The results show that the main reason for the nanocrystallization of the solidified microstructure of the alloy is that its eutectic two - phase growth rate is small, the organization of the roughening rate is small, the solute equilibrium partition coefficient is low and has a relatively low enthalpy of melting; deep undercooled Fe - B - Si alloy bulk nanocrystalline soft magnetic material is prepared by the ideal conditions: to obtain more than cold, the choice of eutectic alloy composition mainly controlled by the diffusion of solute diffusion to obtain Fe2B (Si) phase is completely quasi-spherical morphology secondary granulation irregular Eutectic organization