Si质量分数对RE-Al-Fe合金的组织及其性能的影响

通过在RE-Al-Fe合金(3%RE-Al-Fe)中加入不同质量分数的硅铁,探究Si质量分数对RE-Al-Fe合金的组织及性能的影响。利用扫描电子显微镜和X射线衍射仪分别测试样品的显微组织和相结构。试验结果表明:在3%RE-Al-Fe合金中,不添加Si的合金由FeAl3、Fe2Al5和RE-Al-Fe相组成,随着Si的质量分数(2%、4%、6%、8%)逐渐增加,合金中均出现铝铁硅(Al-Fe-Si)相;随着Si质量分数的增加,Al-Fe-Si相的衍射峰先增强后减弱,当Si质量分数达到6%时衍射峰强度最大;随着Si质量分数的增加,硬度值的变化趋势是先增大后减小,当Si质量分数达到6%时硬度值最大为92HV。

Influence of Si content on the microstructure and property of RE-Al-Fe alloy

The effects of Si content on the microstructure and property of RE-Al-Fe alloys were investigated by doping different amounts of ferrosilicon into 3% RE-Al-Fe alloy. The microstructure and of phase structure of samples was investigated using scanning electron microscope （SEM） and X-ray diffraction （XRD）， respectively. The results showed that 3% RE-Al-Fe without Si was composed of FeAl3， Fe2Al5 and RE-Al-Fe phase. With the gradual increase of Si content （2%， 4%， 6% and 8%）， the Al-Fe-Si phase was observed in alloys. The strength of Al-Fe-Si diffraction peak firstly increased and then decreased with the increase of Si content， and the diffraction peak intensity was highest when the Si content was 6%. Similarly， the hardness of material also firstly increased and then decreased with the increase of Si content， and the maximum hardness was 92HV when the Si content was 6%.