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在63～342K过冷度范围内,对Fe_(82)B_(17)Si_1合金非规则共晶中Fe_2B相的生长形态演化进行了研究。发现:(1)在具有一次再辉的63～164K及255～342K过冷度范围内,随过冷度增加Fe_2B相由变异的小平面结构逐渐转变为树枝状,进而向具有明显定向特征的树枝状和超细的球状转变,该合金Fe_2B相由小平面转变为树枝状的过冷度过渡范围约为63～164K;(2)在具有两次再辉的174～247K过冷度范围内,随初生α相含量的增加枝晶间非规则共晶逐渐向离异共晶转变;(3)在63～154K和312～342K过冷度范围内,该合金非规则共晶中的Fe_2B相存在两次粒化现象,这两次粒化对应于不同的非规则共晶形成机制。
In the range of 63 ~ 342K undercooling, the growth morphologies of Fe_2B phase in the irregular eutectic Fe_ (82) B_ (17) Si_1 alloy were studied. The results show that: (1) Within the range of 63 ~ 164K and 255 ~ 342K undercooling, the faceted structure of Fe_2B phase gradually changes to dendritic with increasing undercooling, Dendritic and ultrafine spheroidal transformation, the transition range of Fe2B phase transition from facet to dendrite is about 63 ~ 164K; (2) Within the range of 174 ~ 247K undercooling (3) In the range of 63 ~ 154 K and undercooling of 312 ~ 342 K, the Fe 2 B phase in the amorphous eutectic of the alloy exists Twice the granulation phenomenon, these two granulation correspond to different irregular eutectic formation mechanism.