TY - JOUR N2 - Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence were confirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy. L1 - http://www.czasopisma.pan.pl/Content/112989/PDF/AMM-2019-3-08-Hong.pdf L2 - http://www.czasopisma.pan.pl/Content/112989 PY - 2019 IS - No 3 EP - 862 DO - 10.24425/amm.2019.129461 KW - Al-Si alloy KW - Microstructure KW - Extrusion KW - Coefficient of thermal expansion KW - trace elements A1 - Ahn, S.S. A1 - Sharief, P. A1 - Lee, C.H. A1 - Son, H.T. A1 - Kim, Y.H. A1 - Kim, Y.C. A1 - Hong, S. A1 - Hong, S.J. PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 64 DA - 2019.09.03 T1 - Effect of Trace Elements (Co, Cr) on the Microstructure and Physical Properties of Al-Si-Cu-Mg-Fe Extruded Alloy SP - 857 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/112989 T2 - Archives of Metallurgy and Materials ER -