Microstructure studies in Al-6% Si-1.9% Cu-x% Mg alloys
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The nature of precipitates formed in the aged Al-6% Si-1.9%Cu-x%Mg alloys (where x varies from 0.2 to 1.13) was investigated using scanning and transmission electron microscopy. Vickers hardness and grain size were measured. Results showed peak hardness around 4 and 10 h ageing time for 0.54% Mg and 1.13% Mg alloy, respectively. Hardness was found to increase with increasing magnesium content except for the 1.13% Mg alloy aged for 10 h. Q-phase particles have been observed and these are most probably responsible for the variation of hardness.
KeywordsPolymer Grain Size Microstructure Microscopy Electron Microscopy
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