Brazability and Erosion by Molten Filler Alloy of Aluminum Base Plates with Intermetallic Compounds(Materials, Metallurgy & Weldability)

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Brazability and erosion by molten Al-10%Si filler alloy have been studied using laboratory made binary aluminum base plates with intermetallic compounds. Base plates were made by single addition of iron, nickel and zirconium up to 1〜2.2 wt%, which contained Al_3Fe, Al_3Ni, Al_3Zr and Al_2Zr respectively. Fillet formation and spreading tests were performed in a vacuum (2×10^<-5> torr) at 605〜625℃. All binary aluminum alloys with additional elements more than 1% exhibited undesirable fillet formation, because of the poor wetting of intermetallic compounds with molten filler alloys. Base plates with fine recrystallization grain size showed large erosion depth. As molten filler alloy preferably penetrated along grain boundaries, base plates with higher recrystallization temperature were believed to provide large erosion depth. The dissolution process of base plate with intermetallic compound into molten filler alloy was seemed to be completed within holding time of 1 min during spread test, after that the isothermal solidification proceeded.
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