熔铸-原位合成TiC/7075复合材料的拉伸和磨损性能

Tensile and Wear Properties of TiC/7075 Composite Prepared by Melt in-Situ Synthesis

摘要:

采用熔铸-原位合成法制备TiC/7075复合材料。结果显示，TiC颗粒以近球形为主，平均尺寸小于1.0 μm。拉伸性能测试发现，复合材料的延伸率虽略有降低，但其拉伸强度和屈服强度较基体7075铝合金分别提高35.8%和 42.2%，表明原位形成的TiC颗粒有效地强化了基体。摩擦磨损结果显示，在9.1 N载荷下质量分数为6%TiC/7075复合材料的耐磨性高于7075铝合金，而在35.8 N载荷下复合材料的耐磨性却低于7075铝合金。并分析了外加载荷对材料耐磨性的影响

Abstract:

TiC/7075 composite was synthesized by melt in-situ synthesis. The TiC particulates were observed from SEM to be nearly spherical shape with an average size of less than 1.0 μm. The experimental results show that the tensile elongation of the composite is slightly decreased, but the tensile strength and yield strength are respectively improved about 35.8% and 42.2% than those of 7075 aluminum alloy, showing that the TiC particulates formed by in-suit reaction strengthen the matrix effectively. The results of wear experiment show that the wear resistance of 6wt％TiC/7075 composite is better than that of 7075 aluminum alloy under lower loading (9.1 N). The wear resistance of the same composite, however, is lower than that of 7075 aluminum alloy under higher loading (35.8 N). The effect of external load on the wear resistance of the materials was analyzed