The mechanical properties and microstructural distribution of the Cu/A1 brazing joints formed by torch-brazing with different Zn-A1 filler metals were investigated. The microstructure of the Zn-A1 alloys was studied b...The mechanical properties and microstructural distribution of the Cu/A1 brazing joints formed by torch-brazing with different Zn-A1 filler metals were investigated. The microstructure of the Zn-A1 alloys was studied by optical microscopy and scanning electron microscopy, and the phase constitution of the Cu/A1 joints was analyzed by energy dispersion spectrometry. The results show that the spreading area of the Zn-A1 filler metals on the Cu and A1 substrates increases as the A1 content increases. The mechanical results indicate that the shear strength reaches a peak value of 88 MPa when A1 and Cu are brazed with Zn-15AI filler metal. Microhardness levels from HV122 to HV515 were produced in the three brazing seam regions corresponding to various microstructure features. The Zn- and Al-rich phases exist in the middle brazing seam regions. However, two interface layers, CuZn3 and A12Cu are formed on the Cu side when the A1 content in the filler metals is 2% and more than 15%, respectively. The relationship between intermetallic compounds on Cu side and Zn-xA1 filler metals was investigated.展开更多
将Zn-3Al焊料片置于6063铝合金待焊内外管材径向间隙中,采用磁脉冲预成形技术成形铝合金待焊接头,然后使用高频感应加热装置对预成形后的待焊接头进行了钎焊连接。研究了不同放电电压、管材间隙及钎料片厚度对磁脉冲预成形铝合金待焊接...将Zn-3Al焊料片置于6063铝合金待焊内外管材径向间隙中,采用磁脉冲预成形技术成形铝合金待焊接头,然后使用高频感应加热装置对预成形后的待焊接头进行了钎焊连接。研究了不同放电电压、管材间隙及钎料片厚度对磁脉冲预成形铝合金待焊接头的结合性能、均匀性系数及成形状态的影响,并对比分析了不同钎焊温度时接头的界面冶金结合状态及显微形貌。结果表明,在放电电压12 k V、管件间隙1.5 mm、钎料片150μm时得到的待焊接头具有良好的外观、管件贴合度及结合强度;在420℃钎焊5 s获得的钎焊接头,其界面结合效果好,在钎料合金与铝母材结合面形成了连续的元素扩散层,钎料层中无任何孔洞及裂纹等焊接缺陷。钎料层由α-Al先共晶相和细小均匀的Zn-Al共晶相组成。展开更多
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...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 microstructure 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.展开更多
基金Project (2009GJC20040) supported by the Scientist and Technician Serve the Enterprise,MOST,China
文摘The mechanical properties and microstructural distribution of the Cu/A1 brazing joints formed by torch-brazing with different Zn-A1 filler metals were investigated. The microstructure of the Zn-A1 alloys was studied by optical microscopy and scanning electron microscopy, and the phase constitution of the Cu/A1 joints was analyzed by energy dispersion spectrometry. The results show that the spreading area of the Zn-A1 filler metals on the Cu and A1 substrates increases as the A1 content increases. The mechanical results indicate that the shear strength reaches a peak value of 88 MPa when A1 and Cu are brazed with Zn-15AI filler metal. Microhardness levels from HV122 to HV515 were produced in the three brazing seam regions corresponding to various microstructure features. The Zn- and Al-rich phases exist in the middle brazing seam regions. However, two interface layers, CuZn3 and A12Cu are formed on the Cu side when the A1 content in the filler metals is 2% and more than 15%, respectively. The relationship between intermetallic compounds on Cu side and Zn-xA1 filler metals was investigated.
文摘将Zn-3Al焊料片置于6063铝合金待焊内外管材径向间隙中,采用磁脉冲预成形技术成形铝合金待焊接头,然后使用高频感应加热装置对预成形后的待焊接头进行了钎焊连接。研究了不同放电电压、管材间隙及钎料片厚度对磁脉冲预成形铝合金待焊接头的结合性能、均匀性系数及成形状态的影响,并对比分析了不同钎焊温度时接头的界面冶金结合状态及显微形貌。结果表明,在放电电压12 k V、管件间隙1.5 mm、钎料片150μm时得到的待焊接头具有良好的外观、管件贴合度及结合强度;在420℃钎焊5 s获得的钎焊接头,其界面结合效果好,在钎料合金与铝母材结合面形成了连续的元素扩散层,钎料层中无任何孔洞及裂纹等焊接缺陷。钎料层由α-Al先共晶相和细小均匀的Zn-Al共晶相组成。
基金Project (2009GJC20040) supported by the Project of Scientist and Technician Serve the Enterprise, the Ministry of Science and Technology, China
文摘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 microstructure 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.
