|
Lu Xueqin
Yang Shanglei
Wu Yixiong
School of Materials Science
and Engineering,
Shanghai Jiaotong University,
Shanghai 200030, China |
|
|
MICROSTRUCTURE
AND PROPERTIES OF 5A03 AND SUS304 IN
TRANSITIONAL BRAZING
Abstract: Stainless steel is so different from aluminum alloys in physical and chemical characters. When they are welded directly, there tend to be Al-Fe brittle compounds on the joint. This paper investigates the processing performance, interface microstructures and mechanical properties of aluminum alloys/stainless steel by way of brazing after brush plating a Ni/Cu transitional layer on stainless steel. After the joints are brazed with Al-Si-Cu-Mg-Zn foil brazing filler metal on different brazing parameters, both the mechanical properties and the microstructures are satisfactory for application. And the influence of the brazing parameters on bonding quality of the brazed joints is discussed in detail. The results reveal that no brittle Al-Fe intermetallic Compound is found in the interfaces. The Ni/Cu electroplating layer effectively hinders the diffusion of Fe atoms from SUS304 to 5A03. Though a little AlCu3 brittle compound is produced, its quantity is too small to affect the strength of the joint.
Key words:
Brittle compounds Ni/Cu transitional layer Diffusion |