Advertisement

Effects of the Extrusion Temperature on Microstructure, Texture Evolution and Mechanical Properties of Extruded Mg–2.49Nd–1.82Gd–0.19Zn–0.4Zr Alloy

  • Lei Xiao
  • Guangyu YangEmail author
  • Shifeng Luo
  • Wanqi Jie
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Microstructure, texture evolution and mechanical properties of extruded Mg–2.49Nd–1.82Gd –0.19Zn–0.4Zr alloy were investigated at extrusion temperatures of 260 °C, 280 °C, 300 °C and 320 °C, with an extrusion ratio of 15 and RAM speed of 3 mm s−1, respectively. The results indicated that the coarse grains of homogenized billets were substantially refined after the extrusion process, which was caused by the refinement of dynamically recrystallization (DRX) and the pinning effect of precipitated Mg5Gd and Mg12(Nd, Gd) particles. The grain size decreased gradually when the extrusion temperature increased from 260 to 280 and 300°C, and then coarsened slightly once the extrusion temperature further increased to 320 °C. Moreover, the DRX process was promoted with the increasing extrusion temperature, and a completely DRX microstructure could be obtained when the extrusion temperature up to 300 °C. The room temperature tensile and compressive yield strength increased when the temperature increased from 260 to 300 °C and then decreased at 320 °C. All extruded alloys exhibited an extremely low tension–compression yield asymmetry, which was mainly attributed to the rare earth (RE) texture component as well as the fine microstructure developed during the extrusion process.

Keywords

Magnesium alloy Extrusion temperature Texture analysis Tension–compression yield asymmetry 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51771152, 51227001 and 51420105005) and the National Key Research and Development Program of China (Grant No. 2018YFB1106800).

References

  1. 1.
    Guan K, Yang Q, Bu FQ, Qiu X, Sun W, Zhang DP, Zheng T, Niu XD, Liu XJ, Meng J (2017) Microstructures and mechanical properties of a high-strength Mg-3.5Sm-0.6 Zn-0.5Zr alloy. Mater. Sci. Eng. A 703:97–107CrossRefGoogle Scholar
  2. 2.
    Jung I, Sanjari M, Kim J, Yue S (2015) Role of RE in the deformation and recrystallization of Mg alloy and a new alloy design concept for Mg-RE alloys. Scr. Mater. 102:1–6CrossRefGoogle Scholar
  3. 3.
    Li YX, Zhu GZ, Qiu D, Yin DD, Rong YH, Zhang MX (2016) The intrinsic effect of long period stacking ordered phases on mechanical properties in Mg-RE based alloys. J. Alloys Compd. 660:252–257CrossRefGoogle Scholar
  4. 4.
    Ning ZL, Wang H, Liu HH, Cao FY, Wang ST, Sun JF (2010) Effects of Nd on microstructures and properties at the elevated temperature of a Mg-0.3Zn-0.32Zr alloy. Mater. Des. 31:4438–4444CrossRefGoogle Scholar
  5. 5.
    Ma L, Mishra RK, Balogh MP, Peng LM, Luo AA, Sachdev AK, Ding WJ (2012) Effect of Zn on the microstructure evolution of extruded Mg-3Nd (-Zn)-Zr (wt.%) alloys. Mater. Sci. Eng. A 543:12–21CrossRefGoogle Scholar
  6. 6.
    Ning ZL, Liu HH, Cao FY, Wang ST, Sun J F, Qian M (2013) The effect of grain size on the tensile and creep properties of Mg-2.6Nd-0.35Zn-xZr alloys at 250 °C. Mater. Sci. Eng. A 560:163–169CrossRefGoogle Scholar
  7. 7.
    Han WY, Yang GY, Xiao L, Li JH, Jie WQ (2017) Creep properties and creep microstructure evolution of Mg-2.49Nd-1.82Gd-0.19Zn-0.4Zr alloy. Mater. Sci. Eng. A 684:90–100CrossRefGoogle Scholar
  8. 8.
    Liu SJ, Yang GY, Luo SF, Jie WQ (2015) Microstructure evolution during heat treatment and mechanical properties of Mg-2.49Nd-1.82Gd-0.19Zn-0.4Zr cast alloy. Mater. Charact. 107:334–342CrossRefGoogle Scholar
  9. 9.
    Wu SW, Oh-ishi K, Kamado S, Uchida F, Homma T, Hono K (2011) High-strength extruded Mg-Al-Ca-Mn alloy. Scr. Mater. 65(3):269–272Google Scholar
  10. 10.
    Hantzsche K, Bohlen J, Wendt J, Kainer KU, Yi SB, Letzig D (2010) Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets. Scr. Mater. 63(7):725–730CrossRefGoogle Scholar
  11. 11.
    Song GL, Stjohn D (2002) The effect of zirconium grain refinement on the corrosion behavior of magnesium-rare earth alloy MEZ. J. Light. Met. 2:1–16CrossRefGoogle Scholar
  12. 12.
    Gao X, Muddle BC, Nie JF (2009) Transmission electron microscopy of Zr-Zn precipitate rods in magnesium alloys containing Zr and Zn. Phil. Mag. Lett. 89(1):33–43CrossRefGoogle Scholar
  13. 13.
    Gill LR, Lorimer GW, Lyon P (2007) The Effect of Zinc and Gadolinium on the precipitation sequence and quench sensitivity of four Mg-Nd-Gd alloys. Adv. Eng. Mater. 9(9):784–792CrossRefGoogle Scholar
  14. 14.
    Li JH, Barrirero J, Sha G, Aboulfadl H, Mücklich F, Schumacher P (2016) Precipitation hardening of an Mg-5Zn-2Gd-0.4Zr (wt.%) alloy. Acta Mater. 108:207–218CrossRefGoogle Scholar
  15. 15.
    Freeney TA, Mishra RS (2010) Effect of friction stir processing on microstructure and mechanical properties of a Cast-Magnesium-Rare earth alloy. Metall. Mater. Trans. A 41:73–84CrossRefGoogle Scholar
  16. 16.
    Nie JF (2012) Precipitation and hardening in magnesium alloy. Metall. Mater. Trans. A 43(11):3891–3939CrossRefGoogle Scholar
  17. 17.
    Zhang BP, Geng L, Huang LJ, Zhang XX, Dong C (2010) Enhanced mechanical properties in fine-grained Mg-1.0Zn-0.5Ca alloys prepared by extrusion at different temperatures. Scr. Mater. 63(10):1024–1027CrossRefGoogle Scholar
  18. 18.
    Murai T, Matsuoka S, Miyamoto S, Oki Y (2003) Effects of extrusion conditions on microstructure and mechanical properties of AZ31B magnesium alloy extrusions. J. Mater. Process. Technol. 141(2):207–212CrossRefGoogle Scholar
  19. 19.
    Tang WQ, Huang SY, Zhang SR, Li DY, Peng YH (2011) Influence of extrusion parameters on grain size and texture distributions of AZ31 alloy. J. Mater. Process. Technol. 211(7):1203–1209CrossRefGoogle Scholar
  20. 20.
    Park SH, Lee JH, Moon BG, You BS (2014) Tension-compression yield asymmetry in as-cast magnesium alloy. J. Alloys Compd. 617:277–280CrossRefGoogle Scholar
  21. 21.
    Imandoust A, Barrett CD, Oppedal AL, Whittington WR, Paudel Y, Kadiri HE (2017) Nucleation and preferential growth mechanism of recrystallization texture in high purity binary magnesium-rare earth alloys. Acta Mater. 138(1):27–41CrossRefGoogle Scholar
  22. 22.
    Wu XW, Jin L, Zhang ZY, Ding WJ, Dong J (2014) Grain growth and texture evolution during annealing in an indirect-extruded Mg-1Gd alloy. J. Alloys Compd. 585:111–119CrossRefGoogle Scholar
  23. 23.
    Jiang Y, Chen YA, Gao GT (2016) Role of volume fraction of second phase particles, dislocation-twin and twin-twin interactions in the reduced tension-compression yield asymmetry. Mater. Des. 97:131–137CrossRefGoogle Scholar
  24. 24.
    Dogan E, Karaman I, Ayoub G, Kridi G (2014) Reduction in tension–compression asymmetry via grain refinement and texture design in Mg-3Al-1Zn sheets. Mater. Sci. Eng. A 610:220–227CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Lei Xiao
    • 1
  • Guangyu Yang
    • 1
    Email author
  • Shifeng Luo
    • 1
  • Wanqi Jie
    • 1
  1. 1.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China

Personalised recommendations