Effect of Equal Channel Angular Pressing on the Microstructure and Shear Strength of an As-Cast Mg-2Si Alloy

Document Type : Original Article

Authors

Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran

Abstract

Although Mg-Si alloys have promising potential applications in various industries, their mechanical properties are challenged by the presence of coarse primary and eutectic Mg2Si particles and their heterogeneous distribution in the microstructure. To address this issue, several methods have been employed to refine the microstructure and improve the mechanical properties. This study examines the effects of equal channel angular pressing on the microstructural evolution and shear strength of an as-cast Mg-2Si alloy. The alloy was initially extruded at 350 °C and then underwent four passes of equal channel angular pressing at 200 °C. Microstructural analysis was conducted using optical and scanning electron microscopy. Shear strength was assessed using the shear punch test. The obtained results indicated that the equal channel angular pressing process led to a more homogeneous distribution of the Mg2Si particles within the microstructure compared to the as-cast alloys, significantly improving the shear strength. In particular, ultimate shear stress  showed a significant increase from 87 MPa in the as-cast condition to 122 MPa after equal channel angular pressing, corresponding to 40 % improvement.

Keywords

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References

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Journal of Advanced Materials in Engineering (Esteghlal)
Volume 43, Issue 2
September 2024
Pages 45-53

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