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基于微观组织的有限元分析模型,研究颗粒团聚对Al基SiC颗粒增强金属基复合材料流变行为的影响。通过建立的3种增强颗粒分布的胞元模型(一个团聚现象、两个团聚现象和随机分布),分析讨论基体和增强颗粒中的等效应力和等效应变的分布规律,以此为基础,获得3种颗粒分布模型下的SiC颗粒增强Al基复合材料的应力应变曲线。结果表明:颗粒增强金属基复合材料的流变行为和力学响应与增强颗粒的分布非常敏感,但在弹性变形阶段这种影响就相对较弱。从增强颗粒的最大主应力分布来看,颗粒团聚增加了SiC颗粒开裂的概率。从基体的静水应力分布来看,颗粒团聚将促进早期的界面脱粘和在韧性基体中形成微空洞。
Based on the microstructure-based finite element analysis model, the effect of particle agglomeration on the rheological behavior of Al-based SiC particles reinforced metal matrix composites was investigated. Based on the three cell models (one reunion phenomenon, two reunion phenomena and random distribution) that enhance the particle distribution, the distribution of the equivalent stress and equivalent strain in the matrix and reinforcement particles is analyzed and discussed. Based on this, The stress-strain curves of SiC particle reinforced Al matrix composites under three particle distribution models were obtained. The results show that the rheological behavior and mechanical response of particle reinforced metal matrix composites are very sensitive to the distribution of particles. However, this effect is relatively weak during the elastic deformation phase. From the point of view of enhancing the maximum principal stress distribution of particles, particle agglomeration increases the probability of cracking of SiC particles. Seen from the hydrostatic stress distribution of the matrix, particle agglomeration will promote the early de-bonding of the interface and the formation of microvoids in the ductile matrix.