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研究非平衡凝固条件下Nd8Fe86B6合金显微组织和凝固行为的变化规律。结果表明,Nd8Fe86B6合金随着冷却速度的增大,组织发生明显变化。当冷却速率低于1.3×103K/s,组成相为Nd2Fe14B、-αFe和富B相;冷却速率介于1.3×103~3.95×105K/s之间组成相为Nd2Fe14B和-αFe相;当冷却速率介于3.95×105~4.51×105K/s时,相组成为Nd2Fe14B相和非晶相;冷却速率大于5.39×105K/s时组织为完全的非晶相。随着冷却速率的增大,各个相的尺寸由微米级别减小到纳米级别。
The variation of microstructure and solidification behavior of Nd8Fe86B6 alloy under non-equilibrium solidification condition was studied. The results show that Nd8Fe86B6 alloy with the cooling rate increases, the organization changed significantly. When the cooling rate is lower than 1.3 × 103K / s, the compositional phase is Nd2Fe14B, -αFe and B-rich phase; the cooling rate is between 1.3 × 103 ~ 3.95 × 105K / s, the composition phase is Nd2Fe14B and -αFe phase; When the temperature is between 3.95 × 105 and 4.51 × 105K / s, the phase composition is Nd2Fe14B phase and amorphous phase. When the cooling rate is greater than 5.39 × 105K / s, the microstructure is completely amorphous. As the cooling rate increases, the size of each phase decreases from the micron level to the nanometer level.