Abstract
A new correction method which is appropriate for the evaluation of Young's modulus of crystalline compounds has been examined and established to correct the size effect. Using a nanoindentation test and the established correction method, Young's moduli of primary Si phase, Al–(Fe,Mn)–Si and Al–Ni compound phases in the hypereutectic Al–Si die cast alloys were evaluated to be 182±9, 208±29 and 170±4 GPa respectively. The rule of mixtures for Young's modulus and the area fraction of each phase were applied to evaluate the Young's modulus of aluminium die cast alloys. The Young's modulus calculated by the rule of mixtures is in good agreement with the value obtained by a tensile test. The combination of the rule of mixtures and nanoindentation test is an effective approach to the precise evaluation of the Young's modulus of aluminium die cast alloys having complicated microstructures.
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