Annealing Response of a Cold-Rolled Binary Al–10Mg Alloy

Abstract

The effect of annealing temperature on microstructure and mechanical properties of a cold-rolled Al–10Mg alloy has been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and tensile testing. The results showed that supersaturated Mg precipitated along grain boundaries and deformation bands during annealing treatment and precipitation size and the concentration of solid solution Mg atoms increased with the rising of annealing temperature. When annealed at low temperature, accumulation and annihilation of dislocations were the primary way of recovery; as temperature increased to 300 °C, recrystallized grains were formed around the large size β phase through particle-stimulated nucleation. A high ultimate strength (550 MPa) and a middle ductility (14%) were obtained when the Al–10Mg alloy was annealed at 200 °C for 1 h. The abnormal decrease of elongation when the Al–10Mg alloy was annealed at 250–300 °C was due to the formation of a continuous network distribution of large size β phase particles along grain boundaries.

Effect of Zn and Cu Addition on Microstructure and Mechanical Properties of Al-10wt%Mg Alloy

“…When the annealing temperature is raised to 150 • C, the X-ray diffraction results show that the solute Mg content decreases significantly, and the yield strength decreases to 291 MPa. Other studies [21] show that the Al 3 Mg 2 phase precipitates at the grain boundary after the annealing temperature of Al-10Mg alloy reaches 200 • C. The higher the annealing temperature, the coarser the precipitated phase, which affects the strength of the alloy. Therefore, it is of great significance for the further development and application of high-Mg-content aluminum-alloy materials to explore how to further improve the strength of high-Mg-content Al-Mg alloy and prevent or avoid the precipitation of the Al 3 Mg 2 phase during annealing treatment.…”