Abstract
Surface defects in aluminium billet production are a real problem for the subsequent extrusion procedure. Extrusion productivity can be influenced by the surface properties, which is defined as surface appearance, surface segregation zone depth and large Mg2Si and β-particles (Al5FeSi). In this research the surface formation during DC casting of 6082 aluminium billets produced by the air slip technology is studied. The surface microstructures of 6082 aluminium alloys with smooth and wavy surface appearances were investigated, including segregation zone depths and phase formation. The results were discussed based on the exudation of liquid metal through the mushy zone. The specific appearance of the wavy surface of 6082 alloys was correlated to how the oxide skin adheres to the underlying mushy zone and coupled to the dendritic coherency and surface tension of the skin. The occurrence of different phases at the very surface and in the layer just below was explained by variations in solidification directions and subsequent segregation patterns.
Highlights
The 6xxx series Al alloys are basically produced for extrusion
Extrusion productivity can be influenced by the surface properties, which is defined as surface appearance, surface segregation zone depth and large Mg2Si and β-particles (Al5FeSi)
In this research the surface formation during direct chill (DC) casting of 6082 aluminium billets produced by the air slip technology is studied
Summary
The 6xxx series Al alloys are basically produced for extrusion. The surface zone of the mentioned alloy, when produced by direct chill (DC) casting, has an important role on the quality of the extruded materials. The depth of the surface segregation should be considered as an important factor in surface quality, and can be defined as a layer in which the alloy contents deviate from the bulk [5, 6]. In the recent paper [7] the surface formation in low-alloyed 6000 series alloys was investigated. In the present paper the study is extended to the more highly alloyed 6082 with a more severe surface segregation, and the different types of surface appearances and phase formations are discussed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IOP Conference Series: Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
