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Investigation of trace elements in an Al–4.8 wt.% Mg–0.3 wt.% Mn alloy by Christian J. Simensen; Ulf Södervall is a Engineering article available to read on EtoBox.

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Sheets of alloy 5182 are commonly made by direct chilled (DC) casting and subsequent homogenisation and hot rolling. One major problem is cracking of the edges during hot rolling. This is a microstructure investigation of sodium and other trace elements, which have been found to contribute to edge cracking, by means of microprobe analysis and SIMS. Microprobe analysis revealed that the DC-castings had an outer zone ~0.3 mm wide that was rich in alloying elements. The main intermetallic phases in this zone are Al 6 (Mn,Fe), Al 3 (Mn,Fe,Cu), Al 8 (Mg,Cu) 5 , a smaller amount of copper-rich phases and Mg 2 Si. The bulk material consists of small grains with mainly Al 6 (Mn,Fe) particles on the grain boundaries. Microsegregations of Si, Ga, Mg and Cu towards dendriteand grain boundaries were detected. The SIMS analyses revealed that the DC-castings had a surface layer 3-7 μm thick that was rich in salts. The latter were particles, mainly (Na,K)F polluted with Cl, Ca, Li and possibly H. The content of salts in the surface was of the order of 1 wt.%. Small amounts of salts, mainly as fluorides, were present down to depths of 10-30 μm. Small numbers of Na-and (Na,K)-particles were found a

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Author

Christian J. Simensen; Ulf Södervall

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley; Research Square (ISSN 0142-2421)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)