为更好地优化组织,提升细化性能,采用熔配—纯金属钛法制各新型铝晶粒细化剂—铝钛硼稀土Al-Ti-B-RE中间合金.试验结果表明:合成反应温度不同,所制备的Al-Ti-B-RE中间合金第二相所具有的形态分布及数量不同,低温反应合成中间合金第二相Al3Ti和Ti2A l20RE稀土相为小块状,高温度反应合成则为长片状.借助X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)等技术对其第二相的微观形貌分布、细化效果及形核能力等进行表征分析.结果表明:第二相粒子形态分布及数量对细化效果有重要影响,第二相中的形核相与基底的错配度越小,越有利于非均质形核,细化效果越好.
To obtain better microstructures and improve refining performance,a new aluminum grain refiner Al-Ti-B-RE master alloy was prepared by a mix molten-pure titanium method.The results show that there are small blocks of Al3Ti and Ti2Al20RE phases in the Al-Ti-B-RE master alloys prepared at optimal temperatures while there are large flakes at high temperature.The morphology,distribution and quantity of second phases of Al-Ti-B-RE master alloys and refining effects and nucleating potentials were studied by XRD,SEM and OM.It is indicated that the morphology,distribution and quantity of second phase particles of Al-Ti-B-RE master alloys have an important influence on the refining effects.A better refining effect could be obtained with the smaller disregistry between nucleation and the substrate in favor of promoting nucleation.
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