盐类反应制备TiB_2/Al-4.5Cu复合材料的研究

TiB 2/Al 4.5Cu Composite by Reaction of Mixed Salts in Molten Metal

采用Ｋ２ＴｉＦ６和ＫＢＦ４混合盐反应法制备ＴｉＢ２／Ａｌ－４．５Ｃｕ复合材料，通过ＳＥＭ，ＸＲＤ及ＭＴＳ等仪器研究了复合材料的凝固组织和力学性能。增强相ＴｉＢ２颗粒细小（＜２μｍ），呈近球形，均匀分布于基体之中，起强化和细化基体作用，ＴｉＢ２颗粒与基体结合好。当Ｋ２ＴｉＦ６和ＫＢＦ４混合物加入质量为基体的２０％时，复合材料的综合性能最好。ＵＴＳ达３５２ＭＰａ，ＥＬ达４．４％，ＨＢ达１４６。

The TiB 2/Al 4.5Cu composite was fabricated by K 2TiF 6/KBF 4 mixed salts reaction in Al 4.5Cu molten metal. The solidification microstructure and mechanical properties of the composite was researched by SEM, XRD and MTS etc. The reinforced TiB 2 particle less than 2 μm, with nearly spheroidal form was uniformly distributed in the matrix, reinforcing and refining metal matrix. Moreover, the TiB 2 particle was combined with AlCu4 alloy well. When the K 5TiF 6 and KBF 4 mixed salts addition is 20% of the metal matrix, the mechanical properties of the composite is best, UTS is 352 MPa, EL is 4.4% , HB is 146.