Fe含量对Al-Fe-Si/Al原位复合材料的影响

Effect of Fe content on Al-Fe-Si/Al in-situ composites

采用搅拌熔铸法制备Al-Fe-Si/Al原位复合材料。利用X线衍射仪(XRD)、扫描电镜(SEM)、能谱分析(EDS)、光学显微镜、XHV-1000数字式显微硬度计、MFT-4000多功能材料表面性能试验仪研究Fe含量对原位复合材料的微观结构、硬度和耐磨性的影响。结果表明:Fe的质量分数为2%时原位复合材料的组织是以长针状的金属间化合物的β-Al5Fe Si为主,并含有少量Al0.3Fe3Si0.7;随着Fe含量的增加,原位复合材料中长针状的β-Al5Fe Si逐渐由长针状长大成粗棒状最后长大成块状;当Fe的质量分数为6%时,复合材料的硬度最高,为108.64HV,约为纯铝的3倍,约为ZL102的1.5倍;表面摩擦性能最佳,摩擦因数最小,为0.288。

The Al- Si- Fe/Al in- situ composite was prepared by the stir casting method. The influence of Fe content on microstructure,hardness and surface friction properties of in- situ composite was investigated by X- ray diffraction（XRD）,scanning electron microcopy（SEM）,energy dispersive spectroscopy（EDS）,optical microscope,XHV- 1000 digital micro hardness tester and MFT-4000 surface properties of multifunctional materials tester. The results show that a large amount of long needle-like β-Al5 Fe Si phases with a little Al0.3Fe3Si0.7are found in the in-situ composite when the mass fraction of Fe is 2%. With the increase of Fe content,the long needle-like β-Al5 Fe Si gradually grows into plate and then into lump in in-situ composites.When the mass fraction of Fe is 6%,the hardness of composites has a peak value（108.64）,which is 3 times that of pure aluminum and 1.5 times that of ZL102. The performance surface friction is optimal with minimum friction coefficient of 0.288.