铝液温度对热爆合成Al-Ti-C中间合金组织的影响

Effect of Molten Aluminum Temperature on Microstructures of Al-Ti-C Master Alloys Prepared by Thermal Explosion Synthesis

利用Al,Ti和C粉末原料,采用铝液中的热爆合成法制备出用于铝及铝合金晶粒细化的Al-Ti-C中间合金。采用扫描电镜(SEM)和X射线衍射(XRD)研究了热爆合成产物的成分,组织与形貌。结果表明:Al-Ti-C中间合金由Al,Al3Ti和TiC三相组成,铝液温度对反应体系温度有重要影响,改变了中间合金中Al3Ti,TiC的形态和分布,并影响其晶粒细化能力。

Al-Ti-C master alloys were prepared by thermal explosion synthesis of Al-Ti-C preforms in molten aluminum, the influence of molten aluminum temperature on the microstructures of Al-Ti-C master alloy and grain refining performance were also investigated using XRD,SEM and grain refining tests. The results indicate that synthesized master alloy consist of Al, Al3 Tiand TiC. Temperature of molten aluminum temperature have remarkable influence on size and distribution of second phase particles （Al3 Ti,TiC） in synthesized products, the size of second phase particles was small and uniform distribution at low temperature of molten aluminum, however, some of aggregations of Al3 Ti and TiC was observed at relatively high temperature of molten aluminum . Grain refining test show that the morphology of second phase particles has a great effect on grain refining performance.