Microstructure and Hardness of Aluminum Silicon Iron and Aluminum Chromium Iron Functionally Graded Alloys
Abstract
Functionally graded materials provide much better performance than materials with fixed properties and compositions. In this study aluminum-based alloys were used to prepare FGM. Al-Si-Fe eutectic composition and Al-Cr-Fe alloys were proposed for this work, Possible applications of these materials are suggested, as automotive pistons or cylinders block. FGM was fabricated by successive stages of stir casting method during the solidification, the mold was subjected to mechanical vibration many. Mechanical and physical tests were carried out such as XRD, microstructure, hardness tests to evaluate the performance of this material. FGM samples were prepared by sequential casting of the tow alloys (Al-Si-Fe) and (Al-Cr-Fe). Two types of samples were studied and compared, with and without mold vibration.
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