摘要
目的以Al-Si-Cu系压铸铝合金AC4B为研究对象,研究不同成分的Zn-Al钎料配合氟铝酸铯膏状钎剂对钎焊接头微观组织和力学性能的影响,以期为压铸铝合金钎焊及其应用提供技术参考。方法采用金相显微镜(OM)、电子扫描电镜(SEM)、能谱分析(EDS)对母材和钎焊接头组织进行分析;采用万能电子试验机对钎焊接头进行压缩剪切试验,并对剪切断口进行分析。结果不同成分的Zn-Al钎料均能获得致密的钎缝组织;钎缝组织主要由Zn基固溶体/Al基固溶体、Zn-Al共晶组织、块状Si组成;随着钎料中Al元素含量的增加,钎焊接头的剪切强度增加。98Zn02Al钎料的剪切强度最低,剪切强度为92 MPa,85Zn15Al钎料的剪切强度最高,达到112 MPa。剪切试样均断裂在钎缝位置,断口平齐,无明显塑性变形;断口存在明显的解理特征,为脆性断裂。结论采用Zn-Al钎料钎焊Al-Si-Cu系压铸铝合金,获得了较为致密的钎焊接头,可为后续压铸铝合金的钎焊研究及应用提供一定的技术参考。
The work aims to study the effect of Zn-Al filler metals with different Al contents on the microstructure and mechanical properties of AC4B die casting aluminum alloy of Al-Si-Cu series,with the aim of providing technical references for brazing of die casting aluminum alloys and applications.Metallographic microscope(OM),electron scanning electron micro-scope(SEM)and energy dispersive spectrometry(EDS)were used to analyze the structure of base metal,brazed joint.A com-pression shear test of brazed joint was carried out by universal electronic testing machine,and the fracture surfaces were ana-lyzed.Zn-Al brazing metal of different composition could obtain dense brazing structure.The brazed joint structure was mainly composed of Zn solid solution/Al-based solid solution,Zn-Al eutectic and Si.The shear strength of the brazing joint increased with the increase of the Al content in brazing filler metal.The shear strength of 98Zn02Al filler metal was the lowest,reaching 92 MPa.The shear strength of 85Zn15Al filler metal was the highest,reaching 112 MPa.The fractures of the shear specimens all occurred at the position of brazing joints,and the fractures were flat without obvious plastic deformation.The fracture had obvious cleavage characteristics and might be brittle fracture.By using Zn-Al brazing filler metal to brazing the die-cast alumi-num alloy,a relatively dense increase joint is obtained,which can provide certain technical references for the subsequent brazing research of the die casting aluminum alloy.
作者
王伟番
路全彬
雷小伟
方乃文
林三宝
李渤渤
WANG Weipan;LU Quanbin;LEI Xiaowei;FANG Naiwen;LIN Sanbao;LI Bobo(State Key Laboratory of High Performance and Advanced Welding Metals,China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450000,China;Luoyang Ship Material Research Institute,Henan Luoyang 471023,China;China Academy of Machinery Harbin Welding Institute Limited Company,Harbin 150028,China;Zhengzhou Research Institute of Harbin Institute of Technology,Zhengzhou 450000,China;Luoyang Shuangrui Precision Casting Titanium Industry Co.,Ltd.,Henan Luoyang 471023,China)
出处
《精密成形工程》
北大核心
2025年第6期89-96,共8页
Journal of Netshape Forming Engineering
基金
河南省科技研发联合基金(225200810013)
浙江省“尖兵领雁+X”研发项目(2024C01086)。
关键词
ZN-AL钎料
压铸铝合金
钎焊
微观组织
剪切强度
Zn-Al brazing filler metals
die casting aluminum alloys
brazing
microstructure
shear strength
