Cu含量对2219铝合金锻件及其焊接接头组织与性能的影响

发布时间：2018-03-31 23:03

本文选题：铝合金　切入点：Cu含量　出处：《航空材料学报》2017年03期

【摘要】：采用力学拉伸实验、焊接实验、电化学阻抗谱(EIS)、循环阳极极化曲线(Tafel)以及金相和扫描电镜(SEM)等分析测试方法,研究Cu含量对2219铝合金锻件组织与性能的影响。结果表明:降低Cu含量,有利于减少2219铝合金基体内的残余结晶相,并有效抑制在合金焊接过程中粗大Al_2Cu相的析出,使基材和焊件的伸长率显著提高,强度略有下降;Cu在铝基体中形成Al_2Cu相诱导合金发生局部腐蚀,使材料的耐腐蚀性能变差,降低Cu含量能够减小合金的腐蚀倾向,改善合金的耐腐蚀性能。
[Abstract]:Mechanical tensile test, welding test, electrochemical impedance spectroscopy (EIS), cyclic anodic polarization curve (Tafell), metallography and scanning electron microscope (SEM) were used. The effect of Cu content on the microstructure and properties of 2219 aluminum alloy forgings was studied. The results showed that the decrease of Cu content was beneficial to the reduction of residual crystalline phase in the base of 2219 aluminum alloy, and the precipitation of coarse Al_2Cu phase in the welding process of 2219 aluminum alloy was effectively inhibited. The elongation of the base material and the welding piece was increased significantly, the strength decreased slightly and the Al_2Cu phase formed in the aluminum matrix caused the local corrosion of the alloy, which made the corrosion resistance of the alloy worse, and the corrosion tendency of the alloy could be reduced by reducing the content of Cu. Improve the corrosion resistance of the alloy.
【作者单位】：中南大学轻合金研究院;中南大学有色金属先进结构材料与制造协同创新中心;中南大学粉末冶金国家重点实验室;北京宇航系统工程研究所;
【基金】：国家重点研发计划(2016YFB0300801) 国家自然科学基金委员会—中国航天科技集团公司航天先进制造技术研究联合基金资助项目(U1637601) 江苏省科技成果转化计划(BA2015075) 国家自然科学基金重大科研仪器设备研制专项(51327902)
【分类号】：TG146.21;TG457.14

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