The influence of the volume fraction of nano-sized TiCN reinforcement additive on the mechanical properties and the microstructure of Al-based composite was studied. It was found that the addition of nano-sized TiCN particulates into the Al-matrix leads to a substantial improvement of the mechanical properties of the composite, TiCN-Al. However, the obtained results showed that the strengthening effect depends on the volume fraction of the additive; It was found, that beyond a certain volume fraction of the additive, instead of improving, the mechanical properties of the composite deteriorate. Based on these results a conclusion was drawn that at least two mechanisms, acting concurrently, are operative in the composite, one toward improving the mechanical properties, while the other toward their deterioration. A hypothesis, that the mechanical properties deteriorate due to the development of cracks in the composite’ matrix proved to be correct. Based on the hypothesis a dependence, coupling together the composite's yield strength with the volume fraction of the reinforcement, was proposed and tested. It is shown, that the worked out dependence fits well the obtained experimental data. The effect of the reinforcement agglomeration on the yield strength of the composite is explained and discussed.

研究了纳米TiCN增强剂的体积分数对铝基复合材料力学性能和微观结构的影响。发现将纳米尺寸的TiCN颗粒添加到Al基体中导致复合材料TiCN-Al的机械性能的显着改善。然而，获得的结果表明，增强效果取决于添加剂的体积分数。已经发现，超过一定体积分数的添加剂，复合材料的机械性能没有改善而是没有改善。基于这些结果得出结论，至少两种同时作用的机制在复合材料中起作用，一种作用是改善机械性能，而另一种作用是降低其性能。一个假设 事实证明，由于复合材料基体中出现裂纹，导致机械性能下降。基于该假设，提出并测试了一种依赖关系，将复合材料的屈服强度与增强材料的体积分数耦合在一起。结果表明，计算出的相关性很好地拟合了获得的实验数据。解释和讨论了增强团聚对复合材料屈服强度的影响。