Effect of Rolling Deformation Amount on Microstructure and Properties of AlFeSi0.2Sc0.2Zr Alloy

AlFeSi0.2Sc0.2Zr alloy prepared by melting casting was rolled at room temperature. The effects of rolling deformation amount (45%, 55%, 65%, 75%, 85%, and 90%) on the microstructure, tensile properties, and thermal conductivity of the alloy were investigated. The results show that AlFeSi0.2Sc0.2Zr alloy before and after rolling all consisted of the matrix aluminum phase, α-AlFeSi, AlZr₂ and AlZr₃. There were shrinkage defects and a large number of fish bone and short rod-like α-AlFeSi primary phases along grain boundaries in the as-cast alloy. After rolling, with the increase of rolling deformation amount, the shrinkage holes in the alloy were closed, the grains were refined, and the dendrites of primary phase were broken and the dendrite distribution became uniform. With increasing rolling deformation amount the tensile strength and thermal conductivity of the alloy increased simultaneously, and the plasticity decreased. When the rolling deformation amount reached 90%, the percentage elongation after fracture was 7.4%, and the fracture mode was still ductile fracture.