Solidification microstructures in rapidly solidified,gas atomized aluminium-lithium alloy powders |
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Authors: | G von Bradsky R A Ricks |
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Affiliation: | (1) Department of Materials Science and Engineering, University of Surrey, GU2 5XH Guildford, Surrey, UK;(2) Present address: Alcan International Ltd, Banbury Laboratories, Southam Road, OX16 7SP Banbury, Oxfordshire, UK |
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Abstract: | The examination of the solidification behaviour and resultant microstructures in an Al-Li-Cu-Mg-Zr alloy processed by high-pressure inert gas atomization is reported. Using analytical transmission electron microscopy some quantification of the segregation behaviour is possible which allows the comparison with a simple solute redistribution model (Scheil analysis). It is shown that for powder sizes likely to be of commercial interest (10 to 20 m), cellular solidification structures are to be expected on atomization, and methods of utilizing such structures are discussed. |
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