Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
Effect of Sr addition on fracture characteristics of high purity Al-Si-Mg type casting alloy
Toshiro KOBAYASHI, Mitsuo NIINOMI, Michimasa YAMAOKA, Toshihiro HARATA, Mahmoud Fouad HAFIZ
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Keywords: Sr modification, Charpy absorbed energy, dynamic fracture toughness, aluminum casting alloy AC4CH, mechanical properties
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1993 Volume 43 Issue 9 Pages 472-477

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Abstract
The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg type casting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC4CH are improved by the addition of Sr associated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.
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