稀土元素Ce对Sr变质的Al-5Si铝合金焊丝含氢量和焊缝气孔率的影响  

Influence of Rare Earth Ce on Hydrogen Content and Weld Porosity of Sr Modified Al-5Si Aluminum Alloy Welding Wires

作　　者：张鹏 薛松柏[1] 费文潘 王博[1] 韩翼龙 裴夤崟 钟素娟 ZHANG Peng;XUE Songbai;FEI Wenpan;WANG Bo;HAN Yilong;PEI Yinyin;ZHONG Sujuan(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450002,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,郑州450002

出　　处：《材料导报》2020年第2期2100-2104,共5页Materials Reports

基　　金：新型钎焊材料与技术国家重点实验室(郑州机械研究所有限公司)开放课题基金资助项目(SKLABFMT201704);江苏高校优势学科建设工程资助项目~~

摘　　要：通过减压凝固法、固态测氢法和X射线检测分别研究了稀土元素Ce对Sr变质的Al-5Si铝合金焊丝熔体吸氢倾向、焊丝合金含氢量和焊缝气孔率的影响。结果表明,单独添加0.02%(质量分数)的Sr时,Al-5Si合金焊丝含氢量和焊缝气孔率显著增加。当向含0.02%Sr的Al-5Si合金中添加0%~0.05%(质量分数)的Ce时,Al-5Si-0.02Sr-xCe合金焊丝含氢量随着Ce含量的增加而降低,并在Ce含量为0.05%时达到最低值0.07 mL/(100 g Al),较Al-5Si-0.02Sr合金焊丝降低了81.6%。进一步增加Ce的含量至0.1%,合金焊丝含氢量基本不变。随Ce含量的增加,焊缝的气孔率与合金焊丝含氢量的变化趋势基本一致,而且对于Ce含量大于等于0.05%的焊丝,其焊接形成的焊缝接头无气孔。Ce的添加对焊接接头的拉伸性能几乎没有影响,但是明显提高了焊接接头的弯曲性能。The effects of rare earth Ce on the hydrogen-absorption tendency of Sr modified molten Al-5Si welding wire,hydrogen content of the welding wire and porosity of the welds were investigated by means of pressure reduction and solidification method,solid-state hydrogen measurement and X-ray detection,respectively.A notable increase in the hydrogen content of Al-5Si aluminum alloy welding wire and porosity of the welds was observed when 0.02wt%Sr was added exclusively.Additionally,when 0wt%~0.05wt%Ce was introduced into Al-5Si-0.02Sr wel-ding wire,the increase of Ce content brought about the decline in hydrogen content of Al-5Si-0.02Sr-x Ce welding wire.And Al-5Si-0.02Sr-xCe welding wire achieved the minimum hydrogen content of 0.07 mL/(100 g Al)under the condition of 0.05wt%Ce,which was 81.6%lower than that of Al-5Si-0.02Sr welding wire.Further raise of Ce content to 0.1wt%failed to make any difference in the hydrogen content of Al-5Si-0.02Sr welding wire.In terms of the weld porosity,it generally shared the same variation trend of hydrogen content of the welding wire caused by the increasing Ce content.Moreover,welds free of gas pore was successfully accessible,when Ce content was no less than 0.05wt%.Adding Ce to Al-5Si-0.02Sr welding wire could scarcely exert any effect on the tensile properties of the welding joints,but obviously improve the bending pro-perties and ductility.

关 键 词：稀土铈 锶 Al-5Si焊丝 含氢量 气孔率 组织 

分 类 号：TG422.3[金属学及工艺—焊接]