Vacuum Brazing of Dissimilar Al 7075 and Al–25 Si Alloy

Metals

Dashuang Liu¹  Ping Wei²  Wei Zhou³  Weimin Long⁴ 

[1] School of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China;School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou 450001, China;

关键词: vacuum brazing;    shear strength;    Al 7075;    Al–25 Si alloy;    microstructure;   

DOI  :  10.3390/met12061042

来源: DOAJ

【 摘 要 】

The vacuum brazing of dissimilar Al 7075 and Al–25 Si alloy was investigated. The brazing filler was copper foil with a thickness of 20 μm, and the brazing temperature was 560 °C held for 10 min. The average shear strength of the brazed joint of dissimilar Al 7075 and Al–25 Si alloy was 26.4 MPa. The copper layer was found to be dissolved completely, and the interface of the joint had an irregular shape with a serrated border, indicating a good metallurgical bonding between the two dissimilar alloys. However, factors which might cause deterioration of the shear strength were also observed, including the formation of the intermetallic compounds such as MgZn₂, Cu₂Al and Mg₂Si, the existence of voids and microcracks, the coarsening of grains in Al 7075, and the coarsening of primary Si in Al–25 Si alloy.

【 授权许可】

Unknown