CAJ | 학술논문

采用Al含量为2％～22％(质量分数)的ZnAl钎料,配合改进型CsF-AlF3钎剂,研究ZnAl钎料在3003铝合金板材上的铺展性能及钎焊接头的力学性能与显微组织.结果表明,当Al含量低于8％时,3003铝合金的火焰钎焊接头成形良好,且抗拉强度较高.钎缝显微组织为Al基固溶体及Zn基固溶体.由于固溶强化作用,钎缝的显微硬度比母材的高.钎缝界面由三部分组成,母材、扩散区和界面区,但影响接头强度的主要因素为钎缝内固溶体的分布情况,而不是扩散区的宽度.
채용Al함량위2％～22％(질량분수)적ZnAl천료,배합개진형CsF-AlF3천제,연구ZnAl천료재3003려합금판재상적포전성능급천한접두적역학성능여현미조직.결과표명,당Al함량저우8％시,3003려합금적화염천한접두성형량호,차항랍강도교고.천봉현미조직위Al기고용체급Zn기고용체.유우고용강화작용,천봉적현미경도비모재적고.천봉계면유삼부분조성,모재、확산구화계면구,단영향접두강도적주요인소위천봉내고용체적분포정황,이불시확산구적관도.
Using Zn-Al filler metal with Al content of 2％-22％ (mass fraction) and improved CsF-AlF3 flux,wetting properties of Zn-Al filler metal on 3003 Al substrate were investigated.The mechanical property as well as the microstructure of the brazed joints was also studied.The results indicate that excellent joints can be produced by means of torch brazing when the Al content is less than 8％.The metallographic structure in the brazing seam is mainly composed of Al based solid solutions and Zn based solid solutions.The high hardness value of brazing seam of the 3003 aluminum alloy is higher than that of the base metal due to the effect of solid solution strengthening.The results also show that three microstrueture zones could be found at the brazing interface; i.e.,base metal,diffusing zone and interface zone.The distribution of the solid solution in the brazing seam is the main factor of the tensile strength rather than the diffusion zone width near the interface.