Zr对亚共晶Al-Si-Cu-Ni-Mg多元合金组织性能的影响  

Effects of Zr on Microstructure and Properties of Hypoeutectic Al-Si-Cu-Ni-Mg Multi element Alloy

作　　者：孙缘 韩梦霞 侯星驰 徐海龙 贾志洁 刘相法[1] SUN Yuan;HAN Mengxia;HOU Xingchi;XU Hailong;JIA Zhijie;LIU Xiangfa(Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials,Ministry of Education,School of Material Science and Engineering,Shandong University,Jinan 250061;Shandong Lixin Aluminum Industry Technology Co.,Ltd.,Binzhou 256600;Shandong Advanced Aluminum Community Management and Operation Co.,Ltd.,Binzhou 256606)

机构地区：[1]山东大学材料科学与工程学院,材料液固结构演变与加工教育部重点实验室,济南250061 [2]山东力信铝业科技有限公司,滨州256600 [3]山东省高端铝共同体管理运营有限公司,滨州256606

出　　处：《特种铸造及有色合金》2024年第12期1650-1657,共8页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金联合基金资助项目(U2241230);山东省高端铝制造与应用创新创业共同体项目(BZGDL-XM-2024-01)。

摘　　要：通过直读式光谱仪、差式扫描量热分析仪(DSC)、场发射扫描电镜(SEM)、万能试验机和电化学工作站等研究了Zr对亚共晶Al-9.5Si-5Cu-2.5Ni-0.5Mg多元合金凝固过程、微观组织、力学性能及耐蚀性能的影响。结果表明,Zr会在Al3CuNi相中微量掺杂,形成Al3(CuSiZr)Ni相,Zr的掺杂对物相结构无影响,但使其形貌由连续的网状演变为离散的板片状,导致耐热相间的搭接连续性和联通率显著降低,这是该多元合金的室温和高温抗拉强度随Zr含量增加(Zr≤0.2%)呈下降趋势的主要原因。此外,Zr会降低合金的自腐蚀电位,同时因Al3CuNi相形貌演变导致腐蚀过程中生成的氧化膜更不完整,使合金耐蚀性变差,且Zr添加量(Zr≤0.2%)越高耐蚀性越差。Effects of Zr on solidification process,microstructure,mechanical properties and corrosion resistance of hypoeutectic Al-9.5Si-5Cu-2.5Ni-0.5Mg multi-alloy were investigated by direct-reading spectrometer,differential scanning calorimetry(DSC),field emission scanning electron microscope(SEM),universal testing machine and electrochemical workstation.The results indicate that Zr is trace doped in Al3 CuNi phase,leading to Al3(CuSiZr)Ni phase.Zr doping hardly affects the phase structure,resulting in the morphology transformation from continuous network to discrete flaky,obviously reducing the overlap continuity and connectivity between the heat-resistant phases,which is the main reason that the room temperature and high temperature tensile strength are decreased with increasing Zr content(Zr≤0.2%).In addition,Zr can reduce the corrosion potential of alloy,and the evolution of Al3 CuNi phase morphology leads to incomplete oxide films during the corrosion process,which deteriorates the corrosion resistance of the alloy.Moreover,the corrosion resistance is worse with Zr content increasing.

关 键 词：AL-SI合金 微观组织 力学性能 耐蚀性能 活塞 

分 类 号：TG146.21[一般工业技术—材料科学与工程]