摘要
针对3003铝合金因组织不均和晶粒粗大而引起的耐蚀性和力学性能下降问题,本研究在3003铝合金中引入重稀土元素Yb,采用金相显微镜和扫描电子显微镜研究了不同稀土Yb含量的3003铝合金在铸态、均匀化退火态和再结晶态的显微组织和元素分布,利用电子万能材料试验机和电化学工作站研究了其室温拉伸力学性能和电化学腐蚀行为。研究表明:稀土Yb对共晶Si相有变质作用,生成富SiYb相;添加稀土Yb可显著细化3003铝合金晶粒尺寸,添加量为0.20%(质量分数)时晶粒尺寸细化效果最佳;稀土Yb的加入使合金的力学性能得到增强,与未添加Yb的3003铝合金相比,添加0.20%Yb后,抗拉强度和伸长率分别提高了15.5%和27.1%;添加稀土Yb可使3003铝合金的开路电位正移,同时减小维钝电流密度、增大钝化区范围,合金表现出更优异的耐腐蚀性能。
In response to issues of decreased corrosion resistance and mechanical properties of 3003 Al alloy caused by the inhomogeneous microstructure and coarse grains,the heavy rare earth element Yb was introduced into the 3003 Al alloy..The microstructure and elemental distribution of 3003 Al alloy with different Yb contents of as-cast,homogenized and recrystallized conditions were studied by metallographic microscope and scanning electron microscope.The room-temperature tensile mechanical properties and electrochemical corrosion behavior were investigated by an electronic universal material testing machine and an electrochemical workstation.The results indicate that Yb has a modification effect on eutectic Si phase,leading to the formation of SiYb-rich phase.Adding the rare earth element Yb can significantly refine the grain size of 3003 aluminum alloy,with the optimal grain refinement achieved at an addition concentration of 0.20%(mass fraction).Furthermore,the addition of Yb enhances the mechanical properties of the alloy.In comparison with 3003 aluminum alloy without Yb,the addition of 0.20%Yb results in a 15.5%increase in tensile strength and a 27.1%increase in elongation.Additionally,the incorporation of rare earth Yb leads to a positive shift in the open circuit potential of the 3003 aluminum alloy,reduces the passivation current density,and expands the passivation zone range,resulting in improved corrosion resistance of the alloy.
作者
陈帅
李经纬
刘斌
王俊一
周惠敏
CHEN Shuai;I Jingwei;LU Bin;ANG Junyi;HOU Huimin(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;Harbin Engineering University,International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province,Harbin 150001,China;School of Mechanical Engineering,Xin Jiang University,Urumqi 830046,China)
出处
《材料科学与工艺》
北大核心
2025年第4期34-42,共9页
Materials Science and Technology
基金
中央高校基本科研业务费项目(3072021CFT1011)
国家自然科学基金资助项目(52263026)
新疆维吾尔自治区自然科学基金资助项目(2022D01C382)
新疆天池人才基金及中央引导地方科技发展基金项目(ZYYD2023B21).
