The Effect of Iron Removal from Al-Si Alloys and Sodium Refinement of the Structure

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Year:
2014
Type of Publication:
Article
Keywords:
Effect, Al Si Alloy, Fe Removal, Structure, Refinement
Authors:
N. E. Nwankwo; E. E. Nnuka
Journal:
IJISM
Volume:
2
Number:
5
Pages:
445-448
Month:
September
Abstract:
The effect of iron removal from Al-Si alloys was studied alongside the effect of sodium refinement of the structure. The properties used to assess structural changes were; ultimate tensile strength, percentage elongation, microhardness, impact strength, bend strength, electrical conductivity and resistivity. The studied alloys were chemically analysed and tested using standard equipment and techniques. The results obtained showed that the ratio of iron to cobalt equals 1:1 gave a decrease of iron from 1.7% to 0.44%. The results further indicated that UTS of cast Al-11%Si +1.7% Co +1%Na alloy increased with the removal of iron from 124.05 N/mm2 to 148.20 N/mm2, percentage elongation from 2.6% to 5.47%, impact strength from 0.054J/cm3 to 0.072J/cm3, while microhardness and electrical conductivity decreased from 236.0 to 231.0 and 1880µs/cm to1054µs/cm respectively for the Co content of 1.7%. Results are explained in terms of the quantity of iron removed and the refinement of the structure by NaCl. Al-11%Si + 1.7%Co + 1%Na alloy which has high mechanical and physical properties was developed and recommended for ingot and shaped castings.

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