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为更好地优化组织,提升细化性能,采用熔配—纯金属钛法制备新型铝晶粒细化剂—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Ti2A120RE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。
In order to optimize the microstructure and improve the refinement performance, a new type of aluminum grain refiner, Al-Ti-B-RE master alloy, was prepared by melting-pure titanium method. The results show that the second phase of Al-Ti-B-RE master alloy has different morphological distribution and quantity due to different reaction temperature. The rare earth phase of Al3Ti and Ti2Al20RE , The synthesis of high temperature reaction is long flake. The second phase morphology distribution, refining effect and nucleation ability were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and optical microscope (OM) The results show that the morphology and number of the second phase particles have an important influence on the refining effect. The smaller the mismatch degree between the nucleation phase and the substrate in the second phase, the more favorable to the heterogeneous nucleation, the better the refining effect .