Effects of particle size and distribution on the mechanical properties of SiC reinforced Al–Cu alloy composites
Effects of particle size and distribution on the mechanical properties of SiC reinforced Al–Cu alloy composites
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DOI：
10.1016/j.msea.2010.11.028
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发表时间：
2011-01
期刊：
影响因子：
6.4
通讯作者：
Zhangwei Wang;M. Song;Chao Sun;Yuehui He
中科院分区：
文献类型：
--
作者：
Zhangwei Wang;M. Song;Chao Sun;Yuehui He
研究了SiC颗粒增强Al-Cu合金复合材料力学性能的综合影响。结果表明，基体与增强体粒径之比越小，SiC颗粒在基体中的分布越均匀。随着混合时间的延长，SiC颗粒在基体中的分布更加均匀。碳化硅颗粒的均匀分布提高了材料的屈服强度、极限抗拉强度和伸长率。4.7μm SiC颗粒增强复合材料的屈服强度和极限抗拉强度高于77μm SiC颗粒增强复合材料的屈服强度和极限抗拉强度，而伸长率则与屈服强度和极限抗拉强度相反。断口形貌观察表明，小SiC粒度（4.7μm）复合材料的主要断裂机制是基体的韧性断裂，并伴有颗粒从基体中“拉出”；大SiC粒度（77μm）复合材料的主要断裂机制是基体的韧性断裂，并伴有SiC颗粒断裂。
This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al–Cu alloy composites. It has been shown that small ratio between matrix/reinforcement particle sizes resulted in more uniform distribution of the SiC particles in the matrix. The SiC particles distributed more uniformly in the matrix with increasing in mixing time. It has also been shown that homogenous distribution of the SiC particles resulted in higher yield strength, ultimate tensile strength and elongation. Yield strength and ultimate tensile strength of the composite reinforced by 4.7μm sized SiC particles are higher than those of composite reinforced by 77μm sized SiC particles, while the elongation shows opposite trend with yield strength and ultimate tensile strength. Fracture surface observations showed that the dominant fracture mechanism of the composites with small SiC particle size (4.7μm) is ductile fracture of the matrix, accompanied by the “pull-out” of the particles from the matrix, while the dominant fracture mechanism of the composites with large SiC particle size (77μm) is ductile fracture of the matrix, accompanied by the SiC particle fracture.