Metallurgical Engineering

Metallurgical Engineering

The effect of pre-existing twin on the shear deformation behavior of AZ31 magnesium alloy

Document Type : Research Paper

Authors
Seyed Mahmood Fatemi 1
Ali Akbar kazemi Asl 2
Amir Abedi 1
1 Assistant Professor, Department of Materials and Metallurgical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.
2 B. Sc., Department of Materials and Metallurgical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.
10.22076/me.2021.141433.1303
Abstract
In this research, the shear deformation behavior of an AZ31 magnesium alloy was studied at a temperature range of 200-440 °C by employing shear punch testing method. To introduce twins, a rolled alloy was pre-strained, and the shear deformation of pre-twinned material was compared with the annealed one. The results showed that pre-existing twins led to a higher shear strength owing to the strengthening role of twin boundaries. At 320 °C, due to the activation of nonbasal slip systems, the twin boundaries act as dislocation sink and facilitate dynamic recovery. At high temperatures, as the twins were simply recovered no appreciable difference in deformation behavior and final microstructure could be realized between the alloys with and without twins. Twin boundaries provide more frequent nucleation sites for new grains and also deformation inhomogeneities, increasing the fraction of new grains at 200 and 260 °C. Finer recrystallized grains were obtained during shear deformation, compared to those compression /tension at similar conditions. The latter was discussed relying on the role of shear strain in evolution of fine microstructures.
Keywords
twinning
shear behavior
slow stress
recrystallization
  1. Barnett M. Influence of deformation conditions and texture on the high temperature flow stress of magnesium AZ31. Journal of light Metals. 2001;1(3):167-77.
  2. Barnett M, Keshavarz Z, Beer A, Atwell D. Influence of grain size on the compressive deformation of wrought Mg-3Al-1Zn. Acta materialia. 2004;52(17):5093-103.
  3. Knezevic M, Levinson A, Harris R, Mishra RK, Doherty RD, Kalidindi SR. Deformation twinning in AZ31: Influence on strain hardening and texture evolution. Acta Materialia. 2010;58(19):6230-42.
  4. Savage DJ, McWilliams BA, Vogel SC, Trujillo CP, Beyerlein IJ, Knezevic M. Mechanical behavior and texture evolution of WE43 magnesium-rare earth alloy in Split-Hopkinson Pressure Bar and Taylor Impact Cylinder Testing. International Journal ofImpact Engineering. 2020:103589.
  5. Chen P, Wang F, Li B. Dislocation absorption and transmutation at {101¯ 2} twin boundaries in deformation of magnesium. Acta Materialia. 2019;164:440-53.
  6. Cai Y, Sun C, Li Y, Hu S, Zhu N, Barker E, et al. Phase fieldmodeling of discontinuous dynamic recrystallization in hot deformation of magnesium alloys. International Journal of Plasticity. 2020:102773.
  7. Peng J, Zhang Z, Yang P, Li Y, Guo P, Zhou W, et al. The effect of continuous confined strip shearing deformation on the mechanical properties of AZ31 magnesium alloys. Materials Science and Engineering: A. 2019;743:397-403.
  8. Niu Y, Le Q, Ning F, Hou J, Jia Y. Strain induced dynamic recrystallization nucleation of ZA21 magnesium alloy during compression processat low and medium temperatures. Journal of Materials Research and Technology. 2020;9(1):340-6.
  9. Fatemi S, Aliyari S, Miresmaeili S. Dynamic precipitation and dynamic recrystallization during hot deformation of a solutionized WE43 magnesium alloy. Materials Science and Engineering: A. 2019;762:138076.
  10. Miura H, Yu G, Yang X. Multi-directional forging of AZ61Mg alloy under decreasing temperature conditions and improvement of its mechanical properties. Materials Science and Engineering: A. 2011.
  11. Lapovok R, Thomson P, Cottam R, Estrin Y. The effect of grain refinement by warm equal channel angular extrusion on room temperature twinning in magnesium alloy ZK60. Journal of Materials Science. 2005;40(7):1699-708.
  12. Tam KJ, Vaughan MW, Shen L, Knezevic M, Karaman I, Proust G. Modelling the Temperature and Texture Effects on the Deformation Mechanisms of Magnesium Alloy AZ31. International Journal of Mechanical Sciences. 2020:105727.
  13. Zhang H, Yang M, Hou M, Wang L, Zhang Q, Fan J, et al. Effect ofpre-existing {101¯ 2} extension twins on mechanical properties, microstructure evolution and dynamic recrystallization of AZ31 Mg alloy during uniaxial compression. Materials Science and Engineering: A. 2019;744:456-70.
  14. Chaudry UM, Kim TH, Kim YS, Hamad K, Ko YG, Kim J-G. Dynamic recrystallization behavior of AZ31-0.5 Ca magnesium alloy during warm rolling. Materials Science and Engineering: A. 2019;762:138085.
  15. Toloczko M, Hamilton M, Lucas G. Ductility correlations between shear punch and uniaxial tensile test data. Journal of nuclear materials. 2000;283:987-91.
  16. Guduru R, Scattergood R, Koch C, Murty K, Nagasekhar A. Finite element analysis of a shear punch test. Metallurgical and Materials Transactions A. 2006;37(5):1477-83.
  17. Fatemi-Varzaneh S, Zarei-Hanzaki A, Beladi H. Dynamic recrystallization in AZ31 magnesium alloy. Materials Science and Engineering: A. 2007;456(1-2):52-7.
  18. Sahoo SK, Toth LS, Biswas S. An analytical model to predict strain-hardening behaviour and twin volume fraction in a profoundly twinning magnesium alloy. International Journal of Plasticity. 2019;119:273-90.
  19. Li N, Huang G, Zhong X, Liu Q. Deformation mechanisms and dynamic recrystallization of AZ31 Mg alloy with different initial textures during hot tension. Materials & Design. 2013;50:382-91.
  20. Xie C, He J, Zhu B, Liu X, Zhang J, Wang X, et al. Transition of dynamic recrystallization mechanisms of as-cast AZ31 Mg alloys during hot compression. International Journal of Plasticity. 2018;111:211-33.
  21. Agarwal G, Dongare AM. Deformation twinning in polycrystalline Mg Microstructures at High strain Rates at the Atomic scales. Scientific reports. 2019;9(1):1-11.
  22. Somekawa H, Mukai T. Hall–Petch relation for deformation twinning in solid solution magnesiumalloys. Materials Science and Engineering: A. 2013;561:378-85.
  23. Chen P, Ombogo J, Li B. Dislocation↔ twin transmutations during interaction between prismatic slip and {101¯ 1} twin in magnesium. Acta Materialia. 2020;186:291-307.
  24. Yang Y, Qin Q, Zhang Z, Wang Q, Meng M, Liang M-j, et al. Processing maps of extruded AZ80+ 0.4% Ce magnesium alloy. Journal of Alloys and Compounds. 2020;844:156064.
  25. Segal V. Severe plastic deformation: simple shear versus pure shear. Materials Science and Engineering A. 2002;338(1-2):331-44.

  • Receive Date 24 November 2020
  • Revise Date 26 May 2021
  • Accept Date 30 June 2021