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测定了经过900℃不同时间热处理的SiC/Ti-6Al-4V复合材料的拉伸强度,并采用全局载荷分配模型计算了复合材料的强度。发现长时间热处理后,复合材料强度的计算值与实测值吻合很好,但该模型对未经热处理的制备态试样的预测值偏高。扫描电镜和透射电镜微观分析表明,随着热处理时间的延长,SiC/Ti-6Al-4V复合材料的界面反应区增厚而SiC纤维的C涂层逐渐消耗,复合材料的界面结合强度逐渐增加但抗拉伸强度逐渐下降。界面反应形成的反应产物主要为TiC,在C涂层消耗完的区域还形成了Ti5Si3。界面反应是使复合材料力学性能变差的主要原因。
The tensile strength of SiC / Ti-6Al-4V composite treated at 900 ℃ for different time was measured and the strength of composite was calculated by global load distribution model. It is found that the calculated value of the strength of the composite material is in good agreement with the measured value after prolonged heat treatment. However, the predicted value of the prepared sample without heat treatment is high. The results of scanning electron microscopy and transmission electron microscopy showed that the interface reaction zone of SiC / Ti-6Al-4V composites thickened and the C coating of SiC fibers gradually consumed as the heat treatment time prolonged, but the interface bonding strength of the composites increased gradually Tensile strength decreased gradually. The reaction product formed by the interface reaction is mainly TiC, and Ti5Si3 is also formed in the depleted area of the C coating. Interface reaction is to make the mechanical properties of the composite material deterioration of the main reasons.