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Microstructural evaluation of rapidly solidified Al-7Cr melt-spun ribbons
Jurči, Peter ...
The practical use of conventional bulk materials is limited by various segregation phenomena, which occur during the solidification and cannot be eliminated in the solid state. Rapid solidification ...technology (RST) and its introduction into material processing overcame the problems of unacceptable material quality and broadened the range of material that was possible to fabricate. The use of conventional ingot metallurgy for the fabrication of aluminium alloys with a larger portion of the elements having a low diffusion coefficient is impossible because coarse, hard and brittle intermetallics are formed and the alloys have poor mechanical properties. The use of RST brings the possibility to produce them without any problems; however, before the standard production the structure and properties of the rapidly solidified semi-products as well as the consolidated bulk product must be evaluated systematically. In this paper, melt spun ribbons made under various conditions from the binary Al-7 % Cr alloy are investigated. The structure wascomposed of crystalline phases: a supersaturated Al-solid solution with a high dislocation density, precipitates of chromium-rich phases and rosette-like eutectics formed from an Al-solid solution and the Al7Cr intermetallic phase. The quality of the phases is related to the processing conditions, but only to a very limited extent.
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