颗粒尺寸、挤压和时效时间对SiC颗粒增强Al-Cu-Mg基复合材料微观结构及硬度的影响

发布时间：2018-03-06 22:22

  本文选题：Al基复合材料　切入点：Si　出处：《粉末冶金材料科学与工程》2017年01期 　论文类型：期刊论文

【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。
[Abstract]:The effects of sic particle size, extrusion time and aging time on the microstructure and hardness of sic particle reinforced Al-Cu-Mg matrix composites prepared by powder metallurgy were studied. The results show that extrusion has an important effect on the microstructure and hardness of composites. It can greatly promote the uniform distribution of reinforcements in Al matrix and the densification of composites. Both density and hardness were significantly increased. Aging time and sic size had significant effects on the number and size of precipitated phases in the composites. When smaller sic was used as reinforcements, the effect time was prolonged at any time. The precipitated phase was precipitated uniformly in the matrix and did not grow up obviously. There was no peak aging within 12 h. However, when the larger size of sic was used as the reinforcement, the effect time was prolonged at any time, and the precipitate phase in the matrix was not uniform. Some of them were coarsened, and the peak aging appeared in the same aging time range.
，

本文编号：1576754