Abstract
Hot extruded (EX) AZ61 magnesium alloy was processed by the twist channel angular pressing (TCAP) method, which combines equal channel angular pressing (ECAP) and twist extrusion (TE) processes and significantly improves the efficiency of the grain refinement process. Both the initial hot extruded AZ61 alloy and the alloy after completion of TCAP processing were examined by using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) and their corresponding micro-tensile testing (M-TT) and hardness testing at room temperature. The results showed that the microstructure of hot extruded alloy was refined well by TCAP due to dynamic recrystallization (DRX) caused by TCAP. The tensile properties, investigated by micro-tensile testing (M-TT), of the AZ61 alloy were significantly improved due to refined microstructure. The highest tensile properties including YS of 240.8 MPa, UTS of 343.6 MPa and elongation of 21.4% of the fine-grained alloy with average grain size below 1.5 µm was obtained after the third TCAP pass at 200 °C using the processing route Bc.
Highlights
The low mass of magnesium alloys causes that they are more readily used, where mass reduction of various types of components while maintaining mechanical and functional parameters is important, desirable, and cost-effective
During twist channel angular pressing (TCAP) the materials are exposed to severe plastic deformations, which increase with increasing number of passes
In comparison with the conventional equal channel angular pressing (ECAP) it was found that the tensile properties of AZ61 alloy subjected to TCAP process were increased by approx. 34% (Rp0.2 ), 20% (Rm ) and about 25% (A), respectively
Summary
The low mass of magnesium alloys causes that they are more readily used, where mass reduction of various types of components while maintaining mechanical and functional parameters is important, desirable, and cost-effective. 2% of the earth’s crust [3], and the fact that magnesium alloys are characterized by good vibration damping ability, the greatest among all currently known construction materials and high dimensional stability, the research issues focused on these alloys are interesting both at the research and application level [4]. Great properties of this group of materials make it possible to optimize the design process of the constructed elements, due to their reliability and functional properties of the final product [4,5]. Compared to the conventional (coarse-grained) materials that were subjected to SPD processing they are characterized by greater mechanical and physical properties [14,15]
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