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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.

参考文献

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