【摘 要】
：
晶粒细化剂由于向合金熔体中添加了可以作为异质形核核心的粒子从而达到细化合金晶粒的目的.因此,晶粒细化剂被广泛应用于铝合金行业.目前,广泛应用的铸造铝合金用晶粒细化剂主要是Al-Ti-B和Al-Ti-C中间合金.目前制备这两种细化剂的主要方法是通过铝和K2TiF6、 KBF4,K2TiF6、碳粉反应,在中间合金中形成有效的可熔解的Al3Ti和不可熔解的可以作为异质形核核心的TiB2、TiC颗粒.最近
【机 构】
：
北京航空航天大学材料科学与工程学院,空天材料与服役教育部重点实验室,北京100191 日本东北大学
【出 处】
：
第十一届全国固态相变、凝固及应用学术会议
论文部分内容阅读
晶粒细化剂由于向合金熔体中添加了可以作为异质形核核心的粒子从而达到细化合金晶粒的目的.因此,晶粒细化剂被广泛应用于铝合金行业.目前,广泛应用的铸造铝合金用晶粒细化剂主要是Al-Ti-B和Al-Ti-C中间合金.目前制备这两种细化剂的主要方法是通过铝和K2TiF6、 KBF4,K2TiF6、碳粉反应,在中间合金中形成有效的可熔解的Al3Ti和不可熔解的可以作为异质形核核心的TiB2、TiC颗粒.最近几年,一些学者对粉末冶金(PM)法制备Al-Ti-B和Al-Ti-C中间合金进行了研究.PM过程制备的细化剂可以提供精细的分散体,并确保这些颗粒快速熔解或分散进入合金熔体.同时,在制备过程还可以快速调整中间合金中Ti、B和C的含量,并保证合金洁净度.但是,目前对以Al/K2TiF6/KBF4/TiC为原料的粉末冶金法制备Al-Ti-B-C晶粒细化剂的详细研究还很少,以及对各种粉末和细化剂内部结构的观察也很少.
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