Mechanical properties and failure behavior of AZ61 magnesium alloy at high temperatures

  • Wenjun Liu
  • Bin Jiang
  • Suqin Luo
  • Siqiang Chen
  • Fusheng Pan
Metals
  • 7 Downloads

Abstract

To investigate the mechanical behavior of AZ61 alloy in a mushy state, uniaxial tensile tests of as-extruded AZ61 alloy have been implemented at temperatures of 475–575 °C at a strain rate of 3 s−1. Experimental results show that zero strength and zero ductility emerged at 575 and 525 °C, respectively. Abnormal coarse grains with sugar-like morphology and molten Mg17Al12 phases were observed in the brittle temperature range. The grain boundaries and surface were gradually covered partially or completely by a liquefied microstructure as temperatures increased. Small micropores developed into short cracks at temperatures above 525 °C and then to large cracks throughout the grain boundaries at 575 °C. It is therefore suggested that crack propagation was controlled by the quantity and distribution of molten phase in the mushy zone. Three types of interfacial wedge cracks are applied to explicate the fracture behavior of the alloy at elevated temperatures.

Notes

Acknowledgements

The authors are grateful for the financial supports from the Chongqing Science and Technology Commission (cstc2013jcyjC60001, cstc2014jcyjjq0041, cstc2014jcyjjq50002, and cstc2013jcyjA50030); the National Natural Science Foundation of China (51701035, 51531002, 51171212, and 51474043); and the National Science and Technology Program of China (2013CB632200).

References

  1. 1.
    Luo AA (2013) Applications: aerospace, automotive and other structural applications of magnesium. In: Pekguleryuz MO, Kainer KU, Kaya AA (eds) Fundamentals of magnesium alloy metallurgy. Woodhead, Cambridge, pp 266–316CrossRefGoogle Scholar
  2. 2.
    Mordike BL (2001) Development of highly creep resistant magnesium alloys. J Mater Process Tech 117:391–394CrossRefGoogle Scholar
  3. 3.
    Stjohn DH, Easton MA, Qian M, Taylor JA (2013) Grain refinement of magnesium alloys: a review of recent research, theoretical developments, and their application. Metall Mater Trans A 44:2935–2949CrossRefGoogle Scholar
  4. 4.
    Luo A, Pekguleryuz MO (1994) Cast magnesium alloys for elevated temperature applications. J Mater Sci 29:5259–5271.  https://doi.org/10.1007/BF01171534 CrossRefGoogle Scholar
  5. 5.
    Yu Y, Arai K, Itoh S, Kamado S, Kojima Y (2005) Realization of high strength and high ductility for AZ61 magnesium alloy by severe warm working. Sci Technol Adv Mater 6:185–194CrossRefGoogle Scholar
  6. 6.
    Koh Y, Kim D, Seok DY, Bak J, Kim SW, Lee YS, Chung K (2015) Characterization of mechanical property of magnesium az31 alloy sheets for warm temperature forming. Int J Mech Sci 93:204–217CrossRefGoogle Scholar
  7. 7.
    Chino Y, Kimura K, Mabuchi M (2008) Twinning behavior and deformation mechanisms of extruded AZ31 mg alloy. Mater Sci Eng A 486:481–488CrossRefGoogle Scholar
  8. 8.
    Zhu SQ, Yan HG, Xia WJ, Liu JZ, Jiang JF (2009) Influence of different deformation processing on the AZ31 magnesium alloy sheets. J Mater Sci 44:3800–3806.  https://doi.org/10.1007/s10853-009-3513-9 CrossRefGoogle Scholar
  9. 9.
    Li L, Zheng M (2015) Theoretical research on rheological behavior of semisolid slurry of magnesium alloy AZ91D. Comput Mater Sci 102:202–207CrossRefGoogle Scholar
  10. 10.
    Meng Y, Fukushima S, Sugiyama S, Yanagimoto J (2015) Cold formability of AZ31 wrought magnesium alloy undergoing semisolid spheroidization treatment. Mater Sci Eng A 624:148–156CrossRefGoogle Scholar
  11. 11.
    Kleiner S, Ogris E, Beffort O, Uggowitzer PJ (2010) Semi-solid metal processing of aluminum alloy A356 and magnesium alloy AZ91: comparison based on metallurgical consideration. Adv Eng Mater 5:653–658CrossRefGoogle Scholar
  12. 12.
    Flemings MC (1991) Behavior of metal alloys in the semisolid state. Metall Trans A 22:269–293CrossRefGoogle Scholar
  13. 13.
    Dahle AK, Suéry M (2010) Deformation Behavior of Aluminum Alloys during Solidification. Mater Sci Forum 649:337–342CrossRefGoogle Scholar
  14. 14.
    Rauh H, Hippsley CA, Bullough R (1989) The effect of mixed-mode loading on stress-driven solute segregation during high-temperature brittle intergranular fracture. Acta Metall 37:269–279CrossRefGoogle Scholar
  15. 15.
    Sinha S, Kim DI, Fleury E, Suwas S (2015) Effect of grain boundary engineering on the microstructure and mechanical properties of copper containing austenitic stainless steel. Mater Sci Eng A 626:175–185CrossRefGoogle Scholar
  16. 16.
    Nesterova EV, Bouvier S, Bacroix B (2015) Microstructure evolution and mechanical behavior of a high strength dual-phase steel under monotonic loading. Mater Charact 100:152–162CrossRefGoogle Scholar
  17. 17.
    Hippsley CA (2013) Brittle intergranular fracture at elevated temperatures in low-alloy steel. Mater Sci Tech 1:475–479CrossRefGoogle Scholar
  18. 18.
    Molina R, Aluminum Amalberto P, Rosso-Politecnico M, Di T (2011) Mechanical characterization of aluminium alloys for high temperature applications part1: Al–Si–Cu alloys. Metall Sci Tecn 14:1650–1656Google Scholar
  19. 19.
    Jiang B, Liu WJ, Chen SQ, Yang QS, Pan FS (2011) Mechanical properties and microstructure of as-extruded AZ31 mg alloy at high temperatures. Mater Sci Eng A 530:51–56CrossRefGoogle Scholar
  20. 20.
    Li M, Tamura T, Omura N, Miwa K (2010) The solidification behavior of the AZ61 magnesium alloy during electromagnetic vibration processing. J Alloys Compd 494:116–122CrossRefGoogle Scholar
  21. 21.
    Olguín-González ML, Hernández-Silva D, García-Bernal MA, Sauce-Rangel VM (2014) Hot deformation behavior of hot-rolled AZ31 and AZ61 magnesium alloys. Mater Sci Eng A 597:82–88CrossRefGoogle Scholar
  22. 22.
    Yan H, Zhou B (2006) Thixotropic deformation behavior of semi-solid AZ61 magnesium alloy during compression process. Mater Sci Eng B 132:179–182CrossRefGoogle Scholar
  23. 23.
    Anaraki MT, Sanjari M, Akbarzadeh A (2008) Modeling of high temperature rheological behavior of AZ61 mg-alloy using inverse method and ANN. Mater Des 29:1701–1706CrossRefGoogle Scholar
  24. 24.
    Xu Y, Hu L, Sun Y (2013) Deformation behaviour and dynamic recrystallization of AZ61 magnesium alloy. J Alloys Compd 580:262–269CrossRefGoogle Scholar
  25. 25.
    Tsao LC, Chen CH, Wu RW, Chang SY, Chen RS (2015) Plastic flow behavior, microstructure, and corrosion behavior of AZ61 mg alloy during hot compression deformation. J Manuf Processes 18:167–174CrossRefGoogle Scholar
  26. 26.
    Liao C, Wu H, Wu C, Zhu F, Lee S (2014) Hot deformation behavior and flow stress modeling of annealed az61 mg alloys. Prog Nat Sci: Mater Int 24:253–265CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Wenjun Liu
    • 1
    • 2
  • Bin Jiang
    • 1
    • 2
  • Suqin Luo
    • 2
  • Siqiang Chen
    • 1
  • Fusheng Pan
    • 1
  1. 1.College of Materials Science and EngineeringChongqing UniversityChongqingChina
  2. 2.Chongqing Academy of Science and TechnologyChongqingChina

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