Al_2O_3－Al－Si合金复合材料的研究

The study on the Reinforcement of Al-Si Composite with Al2O3 Particles

利用铸造搅拌法制取了由Ａｌ２Ｏ３颗粒增强的Ａｌ－Ｓｉ合金复合材料。通过正文试验，探讨了Ａｌ２Ｏ３颗粒的尺寸、颗粒的体积分数与浇注温度对Ａｌ２Ｏ３颗粒－Ａｌ－Ｓｉ复合材料组织和性能的影响。结果表明：当Ａｌ２Ｏ３，颗粒尺寸为１－３ｍ、体积分数１５－２０％，浇注温度为８００℃时增强效果最佳，强度可提高２０％以上，磨损量可减少６０％－７０％，Ａｌ２Ｏ３颗粒能促进Ｓｉ相形核、有碎化共晶硅并使之细化的作用。

Agitation method is used to produced Al2O3 particle reinbrce Al-Si composite. The effects ofAl2O3 particle size, volume and pouring temperature on microstructure and mechanic properties of Al2O3reinforced Al-Si composite have been studied. The results show that the beg parameters are particles with size l-3μm,volume 15-20%and pouring at 800℃,under these conditions,tensilsength of the composite increasesmore than 20%and wearing weight loss decreases 60-70%,the Al2O3 partldes can also promote the nucleationof primary Si and refine the euectic Si,