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For thixoforming (semi-solid processing) it is necessary to have a fine globular microstructure in a semi-solid range. Here this has been obtained for 7075 aluminium alloy by addition of modifying agents: 0.5 weight % of scandium and zirconium. The thixoforming process was carried out at 632°C which gave about 23 volume % of liquid phase. The microstructure of the thixo-formed part (a rotor) consisted...
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