对含微量Fe的Mg-3％Al合金进行碳质孕育处理,并调整保温时间,研究了保温时间对合金晶粒尺度和晶核组织特征的影响.结果表明:当保温时间在20min内时,合金组织中有效形核粒子主要以Al4C3和Al4C3表层包覆Al-(C)-Fe相的双相粒子为主,合金晶粒得到细化.但随保温时间进一步延长,因沉降聚集或结构变化使得有效形核粒子数量和比例逐渐下降,合金晶粒显著粗化,产生孕育衰退.
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