Microstructural evolution and mechanical properties of Mg alloys after processing by HPTE technique

Document Type : Research Article

Authors

Mechanical Engineering Department, Malayer University, Malayer, Iran

Abstract

This study investigates the effect of high-pressure torsion extrusion (HPTE) as a severe plastic deformation method on the mechanical properties and microstructure of AZ80 and ZK30 alloys. By inducing high strains, HPTE significantly improves the microstructure and mechanical properties of the samples. The alloys were initially produced by centrifugal casting and then subjected to HPTE at room temperature. Shear punch tests and Vickers hardness tests were conducted to assess mechanical properties, and the structure of the samples was examined using electron backscatter diffraction (EBSD). The average grain size of AZ80 alloy decreased from an initial value of 5.10 μm to 2.40 μm, 3.52 μm, and 3.33 μm for the v8ω0.6, v5ω1, and v1ω1 conditions, respectively. For ZK30 alloy, the grain size reduced from 30.87 μm to 6.51 μm under the v6ω0.6 condition. The final shear strength of AZ80 alloy in the extruded sample was 157 MPa, and under HPTE at the v8ω0.6 condition, it increased to 183 MPa. As the ω/v ratio increased, shear strength decreased. For ZK30 alloy, the shear strength in the extruded sample was 147 MPa, and under HPTE at the v6ω0.6 condition, it increased to 176 MPa, showing a 20% improvement. The results indicate that HPTE improves the mechanical properties of both alloys due to grain refinement during the process.

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 12
In Progress
2025

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