Abstract
AlB12-type Al-B alloys were prepared by high temperature treatment of AlB2-type Al-B alloy melts with different distribution morphologies of borides. The results show that when using the “immersion” method, the produced AlB2-type Al-B alloy melt (“alloy melt 1”) contain a small amount of AlB12 phase and many boride agglomerations. The AlB2-type Al-B alloy melt produced by using the “vortex” method (“alloy melt 2”) contains no AlB12 phase and exhibits a well dispersion of AlB2 particles. During the high temperature treatment, the AlB2 particles in close contact with each other in the alloy melts are prone to coalescence, causing the formation of relative large AlB12 particles. The high-speed stirring adopted during the high temperature treatment has an effect of prohibiting the coalescence of AlB2 particles in boride agglomerations.
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