Effects of Sc Microalloying on Microstructure and Properties of As-Extruded Al-5Mg Alloy

Abstract

Al-Mg alloys were fabricated by hot extrusion process after vacuum + argon-protected casting. The effects of Sc microalloying on microstructure and properties of as-extruded Al-5Mg alloy were studied. The results show that alloy 2 containing Sc is partially recrystallized during hot extrusion, resulting in the structure of alloy 2 consisting of 21.8% equiaxed recrystallized structure and 78.2% fine banding structure. The grain size of alloy 2 is about 5.31 μm, which is 83.3% finer than that of alloy 1 without Sc. The sum of the yield strength increments due to grain boundary strengthening (σGB) in alloy 2 is 103.59 MPa, where low angle grain boundary strengthening (σLAGB) is increased by a factor of 4.5, and high angle grain boundary strengthening (σHAGB) is increased by 73.4% compared to that of alloy 1. The addition of 0.2% Sc leads to an increase in the lattice strain and dislocation density of alloy 2, and the dislocation strength (σdis) increases to 41.85 MPa. The alloy 2 with Sc has a higher tensile strength of 380.7 MPa, which is 34.1% higher than that of alloy 1, but alloy 2 has a 46.2% reduction in elongation compared to alloy 1.

Carbenes trapping on Aluminum-Magnesium surface implanted with Silicon, Germanium, Tin: Promising of semiconductors by molecular modeling approach

“…Therefore, operated organic compounds as corrosion stoppers were chosen and determined on the basis of their physicochemical characteristics [20,21] and relatively little consideration has been dedicated to the quantitative estimation of the internal and steric influence of these compounds upon their inhibition yield. In other works, it has been studied the interaction between imidazole and the aluminum surface which is often employed in experimental researches [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] .…”