한국주조공학회

Effect of Fe and Mn contents on the tensile properties has been studied in Al-9wt%Si-0.3wt%Mg alloy. As Fe content of Al-9wt%Si-0.3wt%Mg-0.5wt%Mn alloy increased from 0.15wt% to 0.45wt%, tensile strength of as-cast alloy decreased from 192 MPa to 174 MPa, and elongation of the alloy also decreased from 4.8% to 4.2%. Decrease of these properties can be explained as the formation of plate shape, β-Al5FeSi phase with high Fe/Mn ratio of the alloy. However when Mn content of Al- 9wt%Si-0.3wt%Mg-0.45wt%Fe alloy increased from 0.3wt% to 0.5wt%, tensile strength of T6 aged alloy increased from 265 MPa to 275 MPa, and elongation of the alloy increased from 2.3% to 3.6%. These improvements attribute to chinese script, α-Al15(Mn,Fe)3Si2 phase shape-modified from β- Al5FeSi phase with low Fe/Mn ratio of the alloy.

Al-9%Si-0.3%Mg alloy, Tensile properties, α-Al15(Mn,Fe)3Si2 phase β-Al5FeSi phase.