Investigation of Streaking Defects on Aluminium Extrusions

H. Zhu; Carlos H. Cáceres; Xin Quan Zhang; Malcolm J. Couper; Arne K. Dahle

doi:10.4028/www.scientific.net/MSF.561-565.341

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Electromagnetic Stirring Processing and its Influence on Mechanical Properties of ZL102(or Al-Si) Alloy
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Investigation of Streaking Defects on Aluminium Extrusions
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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Investigation of Streaking Defects on Aluminium...

Investigation of Streaking Defects on Aluminium Extrusions

Abstract:

The presence of surface defects, such as streaking, is one of the most serious quality issues for 6000-series aluminium extrusions. The formation of a streaking defect near a web intersection of a hollow profile was investigated in detail. The streak was apparent on the extrusion in both the as-extruded and the as-anodised conditions. Microstructural examinations indicate that the streaked region contains different surface imperfections compared to the normal region and smaller grains and stronger texture than the normal region. The effects of die design and microstructural variables on the formation of streaks on aluminium extrusions are discussed.