Si含量对Al-Si-Cu-Ni-Mg合金组织和性能的影响  

Effect of Si Content on the Organization and Properties of Al-Si-Cu-Ni-Mg Alloys

作　　者：韩杨 相志磊[1] 陈子勇[1] HAN Yang;XIANG Zhi-lei;CHEN Zi-yong(Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,北京100124

出　　处：《铸造》2024年第6期779-787,共9页Foundry

摘　　要：采用搅拌铸造工艺制备不同Si含量合金,旨在揭示Si含量对Al-Si-Cu-Ni-Mg合金微观组织、力学性能和耐磨性的影响。结果表明,随着Si含量升高,合金中共晶Si长径比和平均长度先升高后降低,Si含量为16wt.%合金的长径比和平均长度最大,分别为8.8μm、24.1μm。经过520℃/6 h固溶+180℃/5 h时效处理后,共晶Si形貌由纤维状变为球状,初晶Si棱角钝化。合金中共晶Si长径比和平均长度均有明显降低,保持与铸态合金相同的变化趋势;Si含量为16wt.%合金的长径比和平均长度分别为3.5μm、12.4μm,初晶Si尺寸没有明显变化。随着Si含量的升高,铸态合金拉伸性能逐渐降低,宏观硬度逐渐上升。经过T6热处理后,合金的拉伸性能和宏观硬度有了明显提升,保持与铸态合金相同的变化趋势,随着Si含量的升高,合金磨损失重减少,耐磨性得到改善。Si含量为16wt.%的合金磨损失重最少,耐磨性最好;继续增加Si含量时,合金耐磨性降低。Different Si content alloys were prepared by stir casting process,aiming to reveal the effect of Si content on microstructure,mechanical properties and wear resistance of Al-Si-Cu-Ni-Mg.The results showed that with the increase of Si content,the aspect ratio and average length of eutectic Si firstly increase and then decrease,and the aspect ratio and average length of the alloy with Si content of 16 wt.%were the largest,which were 8.8 and 24.1μm,respectively.After 520℃/6 h solid solution+180℃/5 h aging treatment,the morphology of the eutectic Si was changed from fibrous to spherical,and the angles of the incipient Si became smooth and rounded.Eutectic Si aspect ratio and average length of the alloy decreased significantly,keeping the same trend as that of the cast alloy,and the aspect ratio and average length of the alloy with Si content of 16wt.% were 3.5 and 12.4μm,respectively,and there was no significant change in the size of incipient Si.The tensile properties of the as-cast alloys gradually decreased and the hardness gradually increased with increasing Si content.After T6 heat treatment,the tensile properties and hardness of the alloys were significantly improved,maintaining the same trend as the cast alloys.With the increase of Si content,the wear loss of the alloy decreases and the wear resistance is improved,the alloy with Si content of 16 wt.% has the least wear loss and the best wear resistance;the wear resistance of the alloy decreases when the Si content continues to increase.

关 键 词：AL-SI合金 SI含量 微观组织 耐磨性 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]