Hardness and microstructural developments of spray formed aluminium alloys with high Mg2Si content during hot extrusion and heat treatment
| Autor: | Volker Uhlenwinkel, N. Ellendt, H.-W. Zoch, A. von Hehl, O. Stelling |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | International Heat Treatment and Surface Engineering. 4:41-46 |
| ISSN: | 1749-5156 1749-5148 |
| Popis: | Spray forming offers the possibility of producing alloys with very fine, homogeneous microstructures. Even materials with high contents of intermetallic precipitates, which cannot be produced by casting because of the high solidification rates required, can be distributed homogeneously. Alloying aluminium with high contents of Mg and Si (>20 wt-%Mg2Si) gives an increase in stiffness plus a significant reduction in density, but a very fine distribution of the Mg2Si particles in the aluminium matrix is required. Therefore, such alloys are commonly produced by spray forming. Post-spraying processes such as forming and heat treatment are generally carried out to optimise properties. To examine the microstructure and hardness as a result of subsequent processing, aluminium alloys with high Mg2Si content (22–30 wt-%) have been produced under a variety of spray forming conditions. The duration and temperature of heating before extrusion were varied. In addition, some specimens were preheated without extr... |
| Databáze: | OpenAIRE |
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