Yang Zhiyu, Fan Jianzhong, Liu Yanqiang, Nie Junhui, Yang Ziyue, Kang Yonglin
National Engineering & Technology Research Center for Non-Ferrous Metals Composites, GRINM Group Corporation Limited, Beijing 101407, China.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 10083, China.
Materials (Basel). 2021 Mar 5;14(5):1219. doi: 10.3390/ma14051219.
The strengthening and weakening effects of SiC particles on composite strength and ductility were studied. Al-Cu-Mg alloys matrices with three different mechanical properties were used. Their yield strength, ultimate strength, and elongation range from 90 to 379 MPa, 131 to 561 MPa, and 18% to 31%, respectively. SiC particles with sizes of 4, 8, 12, 15, 20, and 30 μm were used to reinforce these three matrices, separately, and the composites of eighteen combinations of the particle sizes and matrix strengths were manufactured. Yield strength, ultimate strength, elongation, and fracture morphology of these composites were characterized. Based on the analysis, the strengthening to weakening behavior on strength and ductility were comprehensively discussed. The critical particle size having the best ductility was obtained. The strengthening limit and match range of the particle and the matrix to achieve effective strengthening were defined as a function of the particle size and matrix strength. This work offers an important reference for optimization of mechanical properties of the particle-reinforced metal matrix composites.
研究了SiC颗粒对复合材料强度和延展性的强化与弱化作用。使用了具有三种不同力学性能的Al-Cu-Mg合金基体。它们的屈服强度、极限强度和伸长率分别在90至379MPa、131至561MPa以及18%至31%的范围内。分别使用尺寸为4、8、12、15、20和30μm的SiC颗粒增强这三种基体，并制造了颗粒尺寸与基体强度的十八种组合的复合材料。对这些复合材料的屈服强度、极限强度、伸长率和断裂形态进行了表征。基于分析，全面讨论了强度和延展性方面的强化到弱化行为。获得了具有最佳延展性的临界颗粒尺寸。定义了颗粒与基体实现有效强化的强化极限和匹配范围，作为颗粒尺寸和基体强度的函数。这项工作为优化颗粒增强金属基复合材料的力学性能提供了重要参考。
