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7171 |
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Tuesday, June 21, 2022, Saal Brüssel 2:40 PM Advanced filler alloys |
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Alloys based on Al-Ge-Si system promising for low temperature filler metals creating |
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A. Abramov* / National Research Nuclear University, Germany Alexander Ivannikov / National Research Nuclear University MEPhI, Russia Vasilii Fedorov/ Chemnitz University of Technology, Germany Thomas Uhlig/ Chemnitz University of Technology, Germany Guntram Wagner/ Chemnitz University of Technology, Germany Oleg Sevryukov/ National Research Nuclear University MEPhI, Russia |
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Dissimilar joints became more and more interesting in many applications, such as automotive industry, aerospace and high-power semiconductor device technologies. Joining high-strength aluminum alloy with stainless steel is currently a serious technological challenge. Work is underway towards low heat joining processes such as brazing. However, for the production of high-strength aluminum alloys/stainless steel mixed brazed joints, commonly Al-Si alloys cannot be used due to the lower solidus temperature (550°C - 600°C) of the aluminum alloy. But the Al-Si system is prospective for the development of brazing fillers because alloying can significantly reduce the melting temperature. It is known that high-zinc content in brazing alloys causes erosion effects at the aluminum substrate. The presence of cooper causes to the formation of the brittle Al2Cu intermetallic phases inside the seam. In case of the binary Al-Ge alloy, the high-germanium content cause brittle joints too. As a compromise Al-Ge-Si system can be a promising system for brazing fillers creating due to achievement a satisfactory processability, mechanical properties and low melting temperature. Therefore, this system is in a focus in this investigation. Three different Al-30.4/35.5/40.0-Ge-5.5/4.4/3.4Si wt.% alloys with minimum liquidus temperature in form of ingots were investigated. Amorphous-crystalline brazing fillers were successfully obtained in the form of foils 45±5 ?m thick using the technology of rapidly quenched of a flat melt jet on a setup with a rapidly rotating copper disk. The possibility of application of investigated foils for brazing was demonstrated. |