Dispersoid-free zones in the heat-affected zone of aluminum alloy welds |
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Authors: | B. C. Meyer G. Tempus H. Doyen D. Emanowski T. Hirsch P. Mayr |
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Affiliation: | (1) DaimlerChrysler Aerospace Airbus GmbH, 28199 Bremen, Germany;(2) the Institute für Werkstofftechnik, 28199 Bremen, Germany |
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Abstract: | The local microstructure in the heat-affected zone 1 (HAZ1) of a laser beam-welded Al-Mg-Si-Cu aluminum alloy is investigated closely. Dispersoid-free zones (DFZs), where the dispersoids of the base material (BM) are dissolved, are found in the vicinity of the fusion line (FL). They are not uniformly surrounding a grain, but oriented toward the FL. Their width can be as large as 10 μm. Detailed analysis has revealed a decreased silicon concentration as well as a decreased hardness of the oriented dispersoid-free zones (ODFZs). Two mechanisms for the formation of this welding metallurgical feature are discussed. |
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