Effect of extrusion ratio on microstructure and properties of Al-0.68Mg-0.60Si alloy

Abstract

The effects of extrusion ratio on microstructure and properties of Al-0.68Mg-0.60Si alloy were studied by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), transmission electron microscope (TEM), hardness test and tensile test at room temperature. The results show that with the increase of extrusion ratio, the size of the dispersed particles in the matrix of Al-0.68Mg-0.60Si alloy profile decreases gradually, the degree of dispersion increases, the fraction of small angle grain boundaries decreases, but the recrystallization fraction increases. When the extrusion ratio reaches above 39.6, the texture of the alloy is cubic texture. In addition, in the extrusion deformation process, the hardness and tensile strength of the alloy profile increase first and then decrease with the increase of extrusion ratio (λ=26.8-55.7);when λ is 39.6, the maximum tensile strength of the alloy reaches 284.00MPa.

Keywords

• extrusion ratio
• al-0.68mg-0.60si alloy
• microstructure
• mechanical property