Enhancement of mechanical properties of Al–Mg alloy with a high Mg content solidified under high pressures

Thermal stability of Al–Mg alloys after solidification under high pressures

“…As reported previously, the microstructure of Al-32Mg alloy solidified under 3 GPa is composed of the Al(Mg) solid solution matrix with Mg solubility 27.7 at.% and eutectic colonies consisting of the Al(Mg) solid solution and c phase [18]. The corresponding microstructures of Al-32Mg alloy solidified under 3 GPa and then heated to different temperatures are shown in Figs.…”

“…As reported before, Mg solubility in the Al-32Mg alloy solidified under 1 GPa and 3 GPa is 23.8 at.% and 27.7 at.%, respectively. But the Mg distribution in the solid solution solidified under 2 GPa is inhomogeneous which are 22.7 at.% and 31.5 at.% [18]. The characteristic temperature of solidification under 2 GPa is lower than that of solidification under 1 GPa and 3 GPa, due to its higher Mg solubility (31.5 at.%) with enough volume fraction.…”

“…Al-21.6Mg alloy solidified under 2 GPa can transform to a supersaturated solid solution [17]. A large amount of solid solution with high Mg solubility can be formed in the Al-32Mg and Al-42Mg alloys when solidified under high pressure [18,19]. The precipitation process in the Al(Mg) solid solution prepared by high pressure solidification is considered to be different from those prepared by other methods and may provide some useful information about the formation mechanism of metastable phases, due to the higher Mg solubility and lower vacancy content.…”

Mechanical properties of Al(Mg) solid solution prepared by solidification under high pressures

“…Tensile tests were carried out using an INSTRON 5569 testing machine at a strain rate of 10 −3 s −1 . All of the samples were cut into dog-bone-shaped specimens with a gauge length of 13.0 mm and a cross section of 1.5 mm × 1.0 mm for tensile tests [9]. In order to examine reproducibility, five replicates were used for testing.…”

Solidification of Mg-Zn-Y Alloys at 6 GPa Pressure: Nanostructure, Phases Formed, and Their Stability

“…The melting point of the alloy, the solution redistribution and the undercooling have all been changed under conditions of high-pressure solidification (Ref [10][11][12] so that microstructures have been produced that are much different from those formed during solidification at atmospheric pressure. Furthermore, high-pressure solidification can lead to the formation of new phases or new structures and can influence phase nucleation or grain growth (Ref [13][14][15][16][17][18][19].…”