Effects of volume fraction of SiC particles on mechanical properties of SiC/Al composites
Effects of volume fraction of SiC particles on mechanical properties of SiC/Al composites
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DOI：
10.1016/s1003-6326(09)60040-6
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发表时间：
2009-12-01
影响因子：
4.5
通讯作者：
Song Min
中科院分区：
文献类型：
--
作者：
Song Min
采用粉末冶金法制备了SiC颗粒增强纯铝复合材料。通过模型模拟和实验研究了SiC颗粒体积分数对复合材料力学性能的影响。结果表明，随着SiC颗粒体积分数的增加，复合材料的屈服强度和抗拉强度增加，而伸长率降低。修正的剪滞模型和多尺度模型预测的屈服强度和归一化延伸率与试验数据的变化趋势相似。然而，修正的剪滞模型由于忽略了SiC颗粒的引入所引起的晶粒细化和位错交互作用的强化机制而低估了屈服强度，而多尺度模型由于忽略了基体中分布的孔隙而高估了归一化延伸率。
SiC particle reinforced pure aluminum composites were fabricated using a powder metallurgy method. The effect of the volume fraction of the SiC particles on the mechanical properties of the composites was studied by both model simulation and experiment. The results indicate that the yield strength and tensile strength increase, but the elongation decreases with the increase in the volume fraction of the SiC particles. Both the modified shear lag model and the multi-scale model predicted yield strength and normalized elongation show similar evolution trends with the experimental data. However, the modified shear lag model underestimates the yield strength due to the ignorance of the strengthening mechanisms caused by grain refinement and dislocations interaction by the introduction of the SiC particles, and the multi-scale model overestimates the normalized elongation due to the ignorance of the pores distributed in the matrix.