Abstract
For an Al-Mn alloy heat exchanger fin stocks which continuous casting was simulated in, the effects of Si and Zr addition on strength and recrystallized grain structures after brazing heat treatment were investigated. As a result of tensile test, pre-brazed tensile strength was increased with increasing Si and Zr contents in the Al-Mn alloy. On the other hands, Zr addition have a small effect on post-brazed tensile strength regardless of Si contents. This was attributed the dissolution of Al3Zr or (Al,Si)3Zr precipitates during brazing heat treatment. Post-brazed grain structure were refined with increasing Si contents. Meanwhile, Zr addition led to larger post-brazed grain structures. It was found that Al3Zr or (Al,Si)3Zr precipitated during intermediate annealing played to major role in retarding recrystallization during brazing heat treatment.
Highlights
Al-Mn alloys, having good brazeability, thermal conductivity, corrosion resistance are widely used for the fin stocks of automotive heat exchanger
The aim of this paper is to investigate the effects of Si and Zr addition on strength and recrystallization behaviour after brazing heat treatment of Al-Mn alloy fin stocks that simulate continuous casting
Zr addition have a small effect on post-brazed tensile strength regardless of Si contents
Summary
Al-Mn alloys, having good brazeability, thermal conductivity, corrosion resistance are widely used for the fin stocks of automotive heat exchanger. Recrystallized grain structure was obtained in twin-roll cast Al-Fe-Ni alloy after brazing heat treatment. It was obvious that twin-roll cast Al-Mn alloy fin stocks have high post-brazed tensile strength and coarse recrystallized grain structure compared to Al-Fe alloy fin stocks. It has been suggested that the twin-belt cast Al-Mn alloy fin stocks have more fine dispersoids and higher amount of solute Mn in the aluminium matrix than that of Al-Fe alloy fin stocks after brazing heat treatment. Coarsely recrystallized grain structure was obtained in AA3003 alloy with Zr addition after brazing heat treatment. In continuous cast AlMn-Si alloy with Zr, recrystallized grain size and tensile strength after brazing heat treatment may be further increased
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