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Materials 2014, 7(6), 4224-4242; doi:10.3390/ma7064224

Effect of Processing Steps on the Mechanical Properties and Surface Appearance of 6063 Aluminium Extruded Products

1
Materials Science and Metallurgical Engineering Department, School of Mines, University of Oviedo, Center Campus, Oviedo, Asturias 33004, Spain
2
Materials Science and Metallurgical Engineering Department, Polytechnic School of Engineering, University of Oviedo, Campus of Gijón, Gijón, Asturias 33203, Spain
3
Struers Inc., 2887 N. Southern Hills Drive, Wadsworth, IL 60083-9293, USA
*
Author to whom correspondence should be addressed.
Received: 28 March 2014 / Revised: 18 May 2014 / Accepted: 19 May 2014 / Published: 30 May 2014
(This article belongs to the Special Issue Light Alloys and Their Applications)
View Full-Text   |   Download PDF [1062 KB, uploaded 30 May 2014]   |  

Abstract

6063 aluminum anodized extrusions may exhibit a common surface defect known as streaking, characterized by the formation of narrow bands with a surface gloss different from the surrounding material. The origin of this banding lies in the differential surface topography produced after etching during the anodizing stage, shown to be connected to certain microstructural characteristics. The present study has attempted to determine the origin of these defects and measure the mechanical properties in these zones, properties which were either barely acceptable or did not meet the specification’s requirements. Quantitative metallography and mechanical testing, both tensile and microhardness, were used for materials assessment at the different steps of the process of manufacturing 6063 anodized extrusions. The results of this research show that nonequilibrium solidification rates during billet casting could lead to the formation of coarse eutectic Mg2Si particles which have a deleterious effect on both mechanical properties and surface appearance in the anodized condition. However, differences in the size and density of the coarse Mg2Si particles have been found to exist in the streak profile compared to the surrounding zones. The study revealed the importance of these particles in explaining the origin of the marginal or sub-marginal properties and anodizing surface defects found. View Full-Text
Keywords: casting and forming technologies; alloy design; 6063 aluminium alloys; quantitative metallographic characterization; mechanical characterization; light optical microscopy (LOM); scanning electron microscopy (SEM); streak formation casting and forming technologies; alloy design; 6063 aluminium alloys; quantitative metallographic characterization; mechanical characterization; light optical microscopy (LOM); scanning electron microscopy (SEM); streak formation
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Asensio-Lozano, J.; Suárez-Peña, B.; Vander Voort, G.F. Effect of Processing Steps on the Mechanical Properties and Surface Appearance of 6063 Aluminium Extruded Products. Materials 2014, 7, 4224-4242.

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