摘要
利用OM,SEM/EDS、XRD、室温拉伸及磨损等试验研究了稀有元素Er对Al-Si-Fe-Co合金组织和性能的影响。研究表明,Er元素可有效细化Al-Si-Fe-Co合金的富铁第二相;当添加量为0.5%时(质量分数,下同),α-Al晶粒细化,共晶硅细化效果最佳,其抗拉强度为160.8MPa,延伸率为1.89%,相比于未添加Er的合金分别提高了5.0%和19.6%。但是,当过量添加Er元素时,会析出针状Al3Er相,对块状富铁相的变质效果弱化,并使合金的强度和塑性降低。同时,随着Er含量增加,使得第二相组织的分布更为均匀,并导致合金的硬度上升,磨损率和摩擦系数出现下降。
The effects of rare element Er on microstructure and properties Al-Si-Fe-Co alloy were studied by optical microscope(OM),scanning electron microscopy(SEM)/energy dispersive spectrometer(EDS),X-ray diffraction(XRD),room temperature tensile and frictional wear.The results show that the Er element can effectively refine the eutectic silicon structure in the high-iron aluminum-silicon alloy after Co metamorphism.When the addition amount of Er element is 0.5 wt%,the eutectic silicon has the best refining effect;At the same time,α-Al also obtains a certain refinement,and excessive Er will lead to the precipitation of acicular Al3Er phase,but the Er element has no obvious refinement effect on the bulk iron-rich phase.With the refinement of eutectic silicon,the plasticity of the alloy is enhanced and the tensile strength is also improved.When the Er content is 0.5 wt%,the maximum tensile strength is 160.8 MPa and the elongation after fracture is 1.89%which are increased by 5.0%and 19.6%,respectively,compared to those of the alloy without Er addition.However,when excessive Er element is added,acicular Al3Er phase will precipitate out,weakening the metamorphism effect of blocky Fe-rich phase and reducing the strength and plasticity of the alloy.At the same time,with the increase of Er content,the distribution of the second phase structure becomes more uniform,the hardness of the alloy increases,and the wear rate and friction coefficient decrease.
作者
唐鹏
刘裔源
黄惠毅
胡治流
赵艳君
Tang Peng;Liu Yiyuan;Huang Huiyi;Hu Zhiliu;Zhao Yanjun(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Nanning 530004,China;Guangxi Alnan Institute of Aerospace Transit Aluminum Alloy and Application,Nanning 530031,China;Alnan Aluminium Co.,Ltd,Nanning 530200,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第10期3528-3535,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51661004)
广西自然科学基金(2017GXNSFAA198271)
广西创新驱动项目(AA17202011-1,AA18242003)
广西生态型铝产业协同创新中心项目(20190255)。
