Abstract
Abstract Al-Zn-Mg alloys, being high strength aluminum alloys, have attracted attention as a material of automobile parts that requirehigher mechanical properties and lightness. Automobile parts with complex shapes are manufactured by low-priced casting method,but Al-Zn-Mg alloys are difficult to cast because of its poor hot cracking, feeding, and fluidity. Thus fluidity experiments on Al-Zn-Mg alloys were conducted for the castability evaluation. The effects of Mg and Zn, representative elements of Al-Zn-Mg alloys, onfluidity were observed. Spiral mold was used for fluidity experiments and the lengths of solidified specimens were measured aftermelting and gravity casting. Correlation between microstructures and fluidity length based on the alloy composition was considered.According to the experimental results, as the amount of Mg and Zn increased, fluidity decreased. Also, it was confirmed that flu-idity change by the variation of Mg composition was greater than that of Zn.Key words: Fluidity, Al-Zn-Mg alloy, Spiral test, Gravity casting.(Received March 30, 2012 ; Accepted May 9, 2012)
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