挤压铸造法制备粉煤灰颗粒增强铝基复合材料及显微结构分析

发布时间：2018-03-25 19:39

本文选题：粉煤灰/铝合金复合材料　切入点：挤压铸造　出处：《热加工工艺》2017年04期

【摘要】：以7075铝合金为基体材料,采用挤压铸造法将铝合金熔体压入粉煤灰颗粒堆积体内而制得复合材料。主要通过控制模具的温度、粉煤灰量和合金浇注温度等几个方面来控制材料的制备;通过金相显微镜和环境扫描电镜,分别对不同压力、浇注温度、粉煤灰含量所获得的复合材料显微结构进行观察。结果表明,压力对复合材料的结构及形貌均具有明显影响,压力的增大有利于晶粒细化及孔隙率的减小,并有利于粉煤灰的均匀分布。随着液体浇注温度的提高,粉煤灰的分布也越来越均匀,但同时也伴随着一些缺陷的产生如气孔。粉煤灰相对于合金的量对该复合材料的组织有很大影响,即对孔隙率、粉煤灰的分布状态有明显作用。
[Abstract]:Using 7075 aluminum alloy as the matrix material, the aluminum alloy melt was pressed into the fly ash particle accumulator by squeeze casting method to make the composite material. The preparation of the material is controlled by the amount of fly ash and the pouring temperature of the alloy, and by means of metallographic microscope and environmental scanning electron microscope, the different pressure, pouring temperature, The microstructure of the composite obtained by the content of fly ash is observed. The results show that the pressure has obvious influence on the structure and morphology of the composite, and the increase of pressure is beneficial to the refinement of grain and the decrease of porosity. With the increase of liquid pouring temperature, the distribution of fly ash becomes more and more uniform. But at the same time there are some defects such as porosity. The amount of fly ash relative to the alloy has a great influence on the microstructure of the composite. That is to say the porosity and the distribution of fly ash have a significant effect on the structure of the composite.
【作者单位】：南昌大学机电工程学院;江西省科学院;
【基金】：江西省自然科学基金青年基金(20142BAB216033) 江西省科学院铜钨新材料重点实验室开放基金(2013-KLP-04) 南昌大学创新学分科研训练项目(20140248)
【分类号】：TB333

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