摘要
研究Si C颗粒尺寸、挤压和时效时间对粉末冶金法制备的Si C颗粒增强Al-Cu-Mg基复合材料微观结构及硬度的影响。研究表明,挤压对复合材料的微观结构和硬度有重要影响,能够极大促进增强体在Al基体中的均匀分布和复合材料的致密化。挤压后的复合材料残留微孔减少,密度和硬度均得到显著提高。时效时间和Si C尺寸对复合材料中析出相的数量及尺寸有显著影响。采用较小尺寸的Si C作为增强体时,随时效时间延长,析出相在基体中均匀析出,没有明显长大,在时效12 h内没有出现峰时效。然而,采用较大尺寸的Si C作为增强体时,随时效时间延长,基体中的析出相不是很均匀,并有部分发生明显粗化,在同样的时效时间范围内出现了峰时效。
The effects of reinforcement particle size, extrusion and aging time on microstructure and hardness of SiC particle reinforced Al-Cu-Mg matrix composites manufactured by the powder metallurgy method were investigated. It has been shown that the extrusion has significant effect on the microstructure and hardness of the composites, since it ean greatly improve the distribution uniformity of SiC particles and the densification of composites. The extruded composites have less residual pores, high density and hardness. The aging time and reinforcement size also play important roles on the number and size of precipitates in the matrix of the composites. With increasing the aging time, the precipitates distribute uniformly and do not coarsen obviously in the composites reinforced with relative small sized SiC particles and the peak aging do not appear within the aging time of 12 h. However, with increasing the aging time, the precipitates do not distribute uniformly and some of them coarsen in the composites reinforced by relative large sized SiC particles, and the peak aging appeared within the aging time of 12 h.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2017年第1期26-32,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金(51301206)
深圳市科技计划项目(JCYJ20140509142357196)
