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        Effects of Grain Refinement on the Microstructure, Mechanical Properties and Reliability of AlSi7Cu3Mg Gravity Die Cast Cylinder Heads

        Giulio Timelli,Giordano Camicia,Stefano Ferraro,Roberto Molina 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4

        The effects of grain refinement on the microstructure and mechanical properties of a secondary AlSi7-Cu3Mg gravity die cast cylinder head are reported. Metallographic and image analysis techniques havebeen used to quantitatively examine the macro- and microstructural changes occurring with the addition ofgrain-refining agent. The results indicate that the AlTi5B1 addition produces a fine and uniform grainstructure throughout the casting; this effect is more pronounced in the slowly solidified regions. The initialcontents of Ti and B, which are present as impurity elements in the supplied secondary alloy ingots,are not sufficient to produce effective grain refinement. Under the present casting conditions, the combinedaddition of AlTi5B1 and Sr does not produce any reciprocal interaction or effect on primary α-Aland eutectic solidification. Grain refinement improves the mechanical properties of the as-cast AlSi7Cu3Mgalloy and produces higher Weibull moduli, thus increasing the reliability of the casting. For automotivestructural components, this could be considered an increase in safety.

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