对采用铜模压铸制备的亚快速凝固Al-10Ti中间合金在不同温度和时间下进行保温或重熔处理,采用扫描电镜、光学显微镜和Image-Pro Plus 6.0软件观察和分析Al-10Ti中间合金中Al3Ti相颗粒的微观特征.结果表明:与普通Al-10Ti中间合金相比,亚快速凝固能显著减小合金中Al3Ti相颗粒尺寸、增加其形状因子(φ)值.亚快速凝固Al-10Ti中间合金的最佳熔炼工艺参数为:熔炼温度1300℃,保温时间30～35 min.当保温或重熔温度和保温时间增加时,亚快速凝固Al-1OTi合金中Al3Ti颗粒尺寸和该相的形状因子(φ)值增加.在650℃保温时,Al3Ti相以脱溶析出和Ostwald熟化两种方式长大;在720℃以上重熔时,在重熔初期Al3Ti相以Ostwald熟化和合并生长两种方式长大,在重熔后期则主要以合并方式长大.
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