Optimal Design of Equipment for Al In-situ Composites Fabricated by Reaction Synthesis

Al₃Fe is good candidates for the in situ reinforcement of Al matrix composites. In this work, through optimal design for the conventional stirring casting method to process Al matrix in-situ composites reinforced with Al₃Fe intermetallics. The micro-structural studies shows the primary crystal and needle-like or short line-like intermetallics is eutectic Al₃Fe crystal, the amount of Al₃Fe primary crystal increased with increasing of Fe content in composites. Selecting optimal stirring equipment and stirring parameters and high Fe content to prepare composites, the gotten Al matrix composites has higher mechanical properties and homogeneous and steady microstructure with even distribution of tiny reinforcement in matrix. The tensile strength and elastic modulus of the composites ascended with increasing additions of Fe powder to Al melt (¿20%Fe).