Spray formed and rolled aluminium-magnesium-scandium alloys with high scandium content
✍ Scribed by Th. Herding; O. Keßler; H.-W. Zoch
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 327 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0933-5137
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✦ Synopsis
Abstract
Aluminium‐magnesium‐scandium alloys offer good weldability, high corrosion resistance, high thermal stability and the potential for high strength by precipitation hardening. A problem of aluminium‐scandium alloys is the low solubility of about 0.3 mass‐% scandium when using conventional casting methods. The solution of scandium can be raised by higher cooling rates during solidification. This was realised by spray forming of Al‐4.5Mg‐0.7Sc alloys as flat deposits. Further cooling rates after solidification should also be high to prevent coarse precipitation of secondary Al~3~Sc. Therefore a cooling device was designed for the spray formed flat deposits. The flat deposits were rolled at elevated temperatures to close the porosity from spray forming. Microstructures, aging behaviour and tensile properties of the rolled sheets were investigated. Strength enhancements of about 100 MPa compared to conventional Al‐Mg‐Sc alloys were achieved.