对液相线铸造铝合金形核机理和晶粒长大机制进行了理论分析,提出了液相线铸造形核机理:在小的过冷度下,大量的原子团簇瞬态发展成为晶核.形核数目多且均匀,有利于晶粒在互相抵触之前均呈球形长大.晶粒的长大分为三个阶段.球形长大、枝晶长大和枝晶抵触后枝晶的熟化.重点推导了晶粒球形长大的稳定性判据,即不稳定因子.在凝固的初期.降低冷却强度有利于增大不稳定因子.从而利于球形晶粒的获得:在凝固的中后期,增加冷却强度.有利于保存获得的球形晶粒.
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