Hot Forging of Gravity Casted Al-Mg Alloy

Abstract

Al-Mg alloys with 3, 4.7, 6, 8, and 10%Mg were fabricated using gravity casting with a copper mold at a cooling rate of 30.6 °C/s. Hot forging was conducted at 500 °C with 50% reduction. An increase in Mg content increased the tensile stress but decreased the elongation in the as-cast ingot. The tensile stress and especially the elongation were increased by hot forging. The tensile stress, 0.2% proof stress, and elongation for hot-forged Al-8%Mg were 337 MPa, 154 MPa, and 24%, respectively. These mechanical properties were obtained without heat treatment. The results show that Al-Mg is suitable for cast forging in terms of mechanical properties and energy consumption.