Abstract
The effect of adding Sr in the form of the Al-5 Sr master alloy to commercial A-S4G and high purity Al-4Si alloys on the modification process has been investigated. The volume fraction of the eutectic matrix decreased by modification due to the movement of the eutectic point to the higher Si content side. The tensile properties, especially elongation, have been increased by modification. The elongation of the A-S4G alloy is increased from a value of 0.9 to 15% by modification. Additionally, the elongation of the modified high purity alloy reached a value of 34%. The fracture path of the modified alloys circumvents the α-phase while it is not yet known if it propagates intergranularly or transgranularly through the eutectic matrix. The fracture surface revealed dimple and smooth ripple patterns reflecting the high ductility of the modified alloys.
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Fat-Halla, N. Recent developments in hypoeutectic Al-Si A-S4G alloy. J Mater Sci 25, 3396–3400 (1990). https://doi.org/10.1007/BF00587703
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DOI: https://doi.org/10.1007/BF00587703