采用Al-Cu-Si-Ni钎料钎焊5A06合金接头组织与性能

Microstructures and properties of 5A06 alloy brazed joint with Al-Cu-Si-Ni filler metal

采用Al-Cu-Si-Ni钎料在不同钎焊工艺参数下对5A06铝合金进行真空钎焊试验,研究钎焊温度与保温时间对接头微观组织与力学性能的影响。利用扫描电镜(SEM)和能谱仪(EDS)对接头的微观结构和物相进行分析,通过室温拉伸试验及显微硬度测试确定接头力学性能的演变。结果表明,接头界面结合区域形成多种金属间化合物,如Mg_2Si,CuAl_2等。550℃钎焊时,接头剪切强度明显高于540℃钎焊的接头,且随着钎焊保温时间的延长,接头剪切强度逐步提高。在550℃钎焊30min时接头剪切强度可达74 MPa。

The vacuum brazing of 5A06 aluminum alloy using Al-Cu-Si-Ni filler metal was investigated at different brazing processes.The effects of brazing temperature and time on the shear strength and microstructures of the joints were studied.Microstructures and phase in the brazed joints were studied by means of scanning electron microscopy analysis(SEM)and Energy Disperse Spectroscopy(EDS).Shear strength and micro-Vickers hardness of joints were tested.The results show that the different intermetallic compounds such as Mg_2Si and CuAl_2 formed in the bonding zone.The shear strength of joints brazed at 550 ℃is higher than that at 540 ℃ and increases with the brazing time being increased.The average shear strength of the joints brazed at 550 ℃for 30 min achieves 74 MPa.