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Metals and Materials International

, Volume 25, Issue 3, pp 570–583 | Cite as

High-Temperature Deformation Behavior of Duplex Mg–8.41Li–1.80Al–1.77Zn Alloy Processed by Friction Stir Processing

  • Fu Rong CaoEmail author
  • Guo Qiang Xue
  • Bi Jin Zhou
  • Shun Cheng Wang
Article
  • 103 Downloads

Abstract

To explore the ductility, a novel Mg–8.41Li–1.80Al–1.77Zn (designated as LAZ822) alloy was fabricated by casting, hot rolling and friction stir processing. The maximum elongation to failure of 489.5% was demonstrated in a fine-grained LAZ822 alloy at a temperature of 573 K and an initial strain rate of 1.67 × 10−4 s−1. The true stress exponent of 2, the grain size exponent of 2 and the activation energy of 89.44–121.14 kJ/mol confirm that grain boundary sliding controlled by lattice diffusion governs the rate-controlling deformation process at the temperatures of 523 and 573 K. The viscous resistance models of dual phases were newly established. At 573 K, the lattice viscous resistance of the α-Mg phase is 2644 times as large as that of the β-Li phase, whereas the grain boundary viscous resistance of the α-Mg phase is 3.3 times as large as that of the β-Li phase. Some α-Mg grains remain in an equiaxed state while the other α-Mg grains become connected at elevated temperatures. This experimental evidence corroborates the existence of dynamic grain connection growth. Cavity growth mechanism maps were constructed. The maps reveal that power-law cavity growth or strain controlled cavity growth is the predominant cavity growth mechanism.

Keywords

Superplasticity Mg–Li alloy Friction stir processing Mechanical property Microstructure 

Notes

Acknowledgements

This work was supported by the key project of National Natural Science Foundation of China [Project No. 51334006]. The author (Furong Cao) also appreciates the help from Si Yuan Liu and Rui Kang Su during the preparation of this manuscript.

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Fu Rong Cao
    • 1
    Email author
  • Guo Qiang Xue
    • 1
    • 2
  • Bi Jin Zhou
    • 1
    • 3
  • Shun Cheng Wang
    • 4
  1. 1.School of Materials Science and EngineeringNortheastern UniversityShenyangChina
  2. 2.Technological CenterXi’an Supercrystal Science and Technology Development Co. Ltd.Xi’anChina
  3. 3.School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  4. 4.Institute of Materials Processing and Forming TechnologyGuangdong General Research Institute of Industrial TechnologyGuangzhouChina

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