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

  1. Yu J, Wang J, Li Q, Shang J, Cao J, Sun X. Effect of Zn on microstructures and properties of Mg-Zn alloys prepared by powder metallurgy method. Rare Met Mater Eng. 2016; 45(11):2757–2762. https://doi. org/10.1016/s1875-5372(17)30035-8
  2. Zhao T, Hu Y, Zhang C, He B, Zheng T, Tang A, et al. Influence of extrusion conditions on microstructure and mechanical properties of Mg-2Gd-0.3Zr magnesium alloy. J Magnes Alloy. 2022; 10(2):387–399. https://doi. org/10.1016/j.jma.2020.06.019
  3. Zareian Z, Emamy M, Malekan M, Mirzadeh H,  Kim WJ, Bahmani A. Tailoring the mechanical properties of Mg–Zn magnesium alloy by calcium addition and hot extrusion process. Mater Sci Eng A. 2020; 774. https://doi.org/10.1016/j.msea.2020.138929
  4. Kim B, Hwang J, Park Y, Lee Y. Microstructural improvement of eutectic al + mg2si phases on al–zn–si–mg cast alloy with tib2 particles additions. Materials (Basel). 2021; 14(11). https://doi.org/10. 3390/ma14112902
  5. Safari S, Akhlaghi F. Microstructure and mechanical properties of Al-Mg2Si composite fabricated in-situ by vibrating cooling slope. Trans Nonferrous Met Soc China (English Ed). 2018; 28(4):604–612. https://doi.org/10.1016/S1003-6326(18)64693-X
  6. Ajith Kumar KK, Srinivasan A, Pillai UTS, Pai BC, Chakraborty M. Microstructure and Mechanical Property Correlation of Mg-Si Alloys. Silicon. 2022; 14:9499–9515. https://doi.org/10.1007/s12633-021-01521-6
  7. Seth PP, Parkash O, Kumar D. Structure and mechanical behavior ofin situdeveloped Mg2Si phase in magnesium and aluminum alloys - a review. RSC Adv. 2020; 10:37327–37345. https://doi.org/10.1039/ d0ra02744h
  8. Dai J, Li K, Han WD, Li YH, Li YF, Yin WL, et al. First-principles investigation on the structural, electronic, mechanical and thermodynamic properties of binary phase in Mg-1Si-3RE(RE = La, Ce) alloys. Mater Today Commun. 2021; 26: 1–10. https://doi. org/10.1016/j.mtcomm.2020.101738
  9. Zuo D, Li T, Liang W, Wen X, Yang F. Microstructures and mechanical behavior of magnesium processed by ECAP at ice-water temperature. J Phys D Appl Phys. 2018; 51. https://doi.org/10.1088/1361-6463/aab86d
  10. Xu B, Sun J, Yang Z, Xiao L, Zhou H, Han J, et al. Microstructure and anisotropic mechanical behavior of the high-strength and ductility AZ91 Mg alloy processed by hot extrusion and multi-pass RD-ECAP. Mater Sci Eng A. 2020; 780:139191. https:// doi.org/10.1016/j.msea.2020.139191.
  11. Hashemi M, Alizadeh R, Langdon TG. Recent advances using equal-channel angular pressing to improve the properties of biodegradable Mg‒Zn alloys. J Magnes Alloy. 2023; 11:2260-2284. https:// doi.org/10.1016/j.jma.2023.07.009
  12. Zhang Q, Li Q, Chen X. Research progress of ultrafine grained magnesium alloy prepared by equal channel angular pressing. Mater Res Express. 2021; 8. https://doi.org/10.1088/2053-1591/abe062
  13. Gerashi E, Asadollahi M, Alizadeh R, Mahmudi R. Effects of Sr additions on the microstructural stability and mechanical properties of a cast Mg–4Zn alloy. Mater Sci Eng A. 2022; 843. https://doi.org/10.1016/ j.msea.2022.143127
  14. Jamalpour M, Alizadeh R. Experimental insights toward understanding how the morphology of Mg2Si particles affects degradation behavior of the biodegradable as-cast Mg–Si alloys. Intermetallics. 2024; 165. https://doi.org/ 10.1016/j.intermet.2023.108133
  15. Bian L, Liang W, Ma J, Wang S, Chen K, Xue J, et al. Effect of ECAP on the microstructure and mechanical properties of a high-Mg2Si content Al-Mg-Si Alloy. J Wuhan Univ Technol Mater Sci. 2010; 25:395-398. https://doi.org/10.1007/s11595-010-0009-z
  16. Bian L, Liang W, Xie G, Zhang W, Xue J. Enhanced ductility in an Al-Mg2Si in situ composite processed by ECAP using a modified BC route. Mater Sci Eng A. 2011; 528:3463-3467. https://doi.org/10.1016/j. msea.2011.01.034
  17. Okamoto H. Mg-Si (Magnesium-Silicon). J Phase Equilibria Diffus. 2007; 28:229–230. https://doi.org/ 10.1007/s11669-007-9038-5
  18. Chegini M, Shaeri MH, Taghiabadi R, Chegini S, Djavanroodi F. The correlation of microstructure and mechanical properties of in-situ Al-Mg2Si cast composite processed by equal channel angular pressing. Materials (Basel). 2019; 12:1-12. https:// doi.org/10.3390/ma12091553
  19. Valiev RZ, Langdon TG. Principles of equal-channel angular pressing as a processing tool for grain refinement. Prog Mater Sci. 2006; 51:881-981. https://doi.org/10.1016/j.pmatsci.2006.02.003

 

 

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

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