An investigation on surface defects produced during the extrusion of some aluminum alloys
| Autor: | K.J. Holub, L.J. Matienzo, W. Vandatta |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
inorganic chemicals
Materials science business.product_category Silicon Magnesium Metallurgy Alloy technology industry and agriculture General Engineering chemistry.chemical_element engineering.material equipment and supplies complex mixtures Nitrogen chemistry Alonizing Aluminium engineering Die (manufacturing) Extrusion business |
| Zdroj: | Applications of Surface Science. 15:307-320 |
| ISSN: | 0378-5963 |
| DOI: | 10.1016/0378-5963(83)90025-9 |
| Popis: | Various surface-quality defects are observed on aluminum extrusions. Among these, die pickup, a small buildup of material with a characteristic morphology, is the most common. Although the literature has cited various causes for the origin of these defects, no surface-sensitive techniques have been used to analyze them. Three aluminum alloys, 7075, 2014 and 2024, were selected to determine whether the composition of die pickup is alloy dependent. The effects of the processing atmosphere, i.e., air and nitrogen, were also studied. This investigation shows that alloy composition, extrusion conditions and processing atmosphere all control the appearance of the extrusion surface. Die pickup is an accumulation of magnesium oxide, aluminum oxide and aluminum metal. However, as the concentration of silicon in the 2014 alloy increases, silicon also concentrates in the defects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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