Abstract
The effects of Zn addition on the microstructure and tensile properties of as-extruded Mg-2Al-0.5Ca-xZn (x = 0, 0.3, 0.6, 0.9 wt.%) alloys were investigated in this work. The results showed that the extruded sheets exhibited a completely dynamically recrystallized microstructure, the grain size was refined, and texture weakening was achieved with Zn addition because of the segregation of Zn atoms on grain boundaries, which suppresses the growth of dynamic recrystallized grains. The addition of 0.6 wt.% Zn improved both the tensile strength and ductility of the as-extruded Mg-2Al-0.5Ca alloy. The as-extruded Mg-2Al-0.5Ca-0.6Zn alloy showed a 0.2% proof stress of 145 MPa, an ultimate tensile strength of 317 MPa, and an elongation of 30.0% along the extruded direction. The simultaneous improvement of strength and ductility was mainly due to the fine and homogeneous grain microstructure and the weakened extrude direction (ED)-tilted texture. The as-extruded Mg-2Al-0.5Ca-0.6Zn alloy showed little in-plane anisotropic tensile properties, with a 0.2% proof stress, ultimate tensile strength, and elongation in the 45° direction of 148 MPa, 299 MPa, and 25.0%, and those in the transverse direction of 148 MPa, 269 MPa, and 16.8%, respectively.
Highlights
Magnesium (Mg) alloy is the lightest commercial structural material for engineering applications such as transportation, aerospace, and 3C industries [1,2,3,4,5]
Ca is an inexpensive alloying element compared to rare earth (RE) elements, and it has been reported that Mg alloys with Ca can exhibit an extrude direction (ED)-split texture component similar to RE-containing alloys after the hot deformation process [11,12,13]
Based on the aforementioned information, in this work, we developed a novel extruded Mg-2Al-0.5Ca (AX21) alloy with different Zn contents (0, 0.3, 0.6, and 0.9 wt.%) to obtain comprehensive performance with high ductility and strength
Summary
Magnesium (Mg) alloy is the lightest commercial structural material for engineering applications such as transportation, aerospace, and 3C (consumer electronics, computer, and communication) industries [1,2,3,4,5]. Conventional wrought alloy, e.g., AZ31, usually forms a strong basal texture with the (0002) basal poles parallel to the normal direction (ND) after the hot extrusion or rolling process. The addition of RE elements could improve the mechanical properties of the Mg alloys, the high cost of REs is the limitation for its wide application. Sandlobes et al developed a rolled Mg-1Al-0.1Ca (wt.%) alloy sheet, which showed superior mechanical properties with an ultimate tensile strength of ~220MPa and elongation of about 20% [19]. The purpose was to reveal the influence of Zn addition on the microstructure evolution and tensile properties of the as-extruded Mg-2Al-0.5Ca alloy, and hopefully provide a guide to develop new low-cost wrought Mg alloys with medium strength and high ductility. It will have more advantages in applications if the Mg-2Al-0.5Ca-based alloy has superior mechanical properties
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