Preparation of AlB₁₂-Type Al-B Alloys

AlB 12 -type Al-B alloys were prepared by high temperature treatment of AlB 2 -type Al-B alloy melts with different distribution morphologies of borides. The results show that when using the “immersion” method, the produced AlB 2 -type Al-B alloy melt (“alloy melt 1”) contain a small amount of AlB 12 phase and many boride agglomerations. The AlB 2 -type Al-B alloy melt produced by using the “vortex” method (“alloy melt 2”) contains no AlB 12 phase and exhibits a well dispersion of AlB 2 particles. During the high temperature treatment, the AlB 2 particles in close contact with each other in the alloy melts are prone to coalescence, causing the formation of relative large AlB 12 particles. The high-speed stirring adopted during the high temperature treatment has an effect of prohibiting the coalescence of AlB 2 particles in boride agglomerations.