Microstructure and Mechanical Properties of AA 6082/AISI 304 Joints Brazed Using Al-Ge-Si Filler Metal

Joining aluminum alloys with stainless steel is of great importance in many industrial sectors. Due to the low solidus temperatures of high-strength aluminum alloys, brazing with commercially available filler metals is not possible. Al-Ge-Si filler metals with a lower melting temperature of about 49...

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Bibliographic Details
Published in:Metals (Basel ) 2023-09, Vol.13 (9), p.1574
Main Authors: Fedorov, Vasilii, Uhlig, Thomas, Wagner, Guntram
Format: Article
Language:English
Subjects:
AA 6082
AISI 304
Al-Ge-Si brazing alloy
Alloys
Aluminum alloys
Aluminum base alloys
Amplitudes
Austenitic stainless steels
Brazed joints
brazing
Brazing alloys
Chemical elements
Chromium
Fatigue
Fatigue failure
Fatigue testing machines
Fatigue tests
Filler metals
Foils
Furnace brazing
Furnaces
Germanium
High strength alloys
Induction brazing
Intermetallic compounds
Investigations
Joining
Materials
Mechanical properties
Melt temperature
Metal fatigue
Microstructure
Shear strength
Shear tests
Silicon
Solid solutions
Solidification
Solidus
Stainless steel
Steel, Stainless
Temperature
Vacuum brazing
Vacuum furnaces
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Summary:Joining aluminum alloys with stainless steel is of great importance in many industrial sectors. Due to the low solidus temperatures of high-strength aluminum alloys, brazing with commercially available filler metals is not possible. Al-Ge-Si filler metals with a lower melting temperature of about 490 °C allow these alloys to be joined. They are manufactured in the form of foil via ultrafast solidification. AA 6082/AISI 304 joints are produced via induction brazing and vacuum furnace brazing. In this study, the tensile shear strength and the fatigue behavior of joints are investigated. Joints produced via induction brazing reached a maximum joining strength of 53 MPa, while vacuum-brazed joints achieved a maximum of 20 MPa. The fracture occurs in the reaction zone, especially inside the Al7Fe2(Si,Cr) intermetallic layer. The results of the fatigue tests show that the joints produced via induction brazing achieved 1 × 107 cycles at a stress amplitude of 7 MPa. Vacuum-brazed joints reached this at a stress amplitude of 3 MPa. All fatigue-tested samples fail in the reaction zone. The high hardness and growth of the SiGe solid solution and the Al7Fe2(Si,Cr) intermetallic layer had a major influence on the joining strength and fatigue behavior of AA 6082/AISI 304-brazed joints.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13091574