Dispersoid-free zones in the heat-affected zone of aluminum alloy welds

Authors
Meyer, BC Doyen, H Emanowski, D Tempus, G Hirsch, T Mayr, P
Citation
Bc. Meyer et al., Dispersoid-free zones in the heat-affected zone of aluminum alloy welds, MET MAT T A, 31(5), 2000, pp. 1453-1459
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN journal
10735623 → ACNP
Volume
31
Issue
5
Year of publication
2000
Pages
1453 - 1459
Database
ISI
SICI code
1073-5623(200005)31:5<1453:DZITHZ>2.0.ZU;2-7
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 dissolve d, are found in the vicinity of the fusion line (FL). They are not uniforml y surrounding a grain, but oriented toward the FL. Their width can be as la rge as 10 mu m. Detailed analysis has revealed a decreased silicon concentr ation as well as a decreased hardness of the oriented dispersoid-free zones (ODFZs). Two mechanisms for the formation of this welding metallurgical fe ature are discussed.