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Journal of Materials Science

, Volume 42, Issue 10, pp 3573–3579 | Cite as

Acoustic emission inspection of Portevin-Le Chatelier effect and deformation mechanisms of two Mg–Li–Al alloys

  • Cong WangEmail author
  • Zhuoqun Li
  • Yongbo Xu
  • Enhou Han
Article

Abstract

In this paper, Portevin-Le Chatelier (PLC) effect of LA41 magnesium alloy is reported. With increasing strain rate, both ultimate tensile stresses (σb) and 0.2% proof (σ0.2) stresses increase, while serrations become less severe. Major acoustic emission (AE) peaks appear at the end of elastic region, and transform to burst type signals in the plastic range. In another alloy containing less Li (LA11), serrations are absent and major AE peak values are considerably lowered. Additionally, PLC effect disappears in LA41 after annealing. The role of twins is discussed in details. Actual causes for AE activity during deformation are also proposed.

Keywords

Acoustic Emission Slip System Acoustic Emission Signal Mobile Dislocation Dynamic Strain Aging 

Notes

Acknowledgements

The authors would like to thank NSFC (Grant No. 50371089) for financial support, and Dr. W. Tang, Dr. W. Qiu, Prof. L. Liu and Prof. G. Z. Gao for valuable discussions. Special appreciation is dedicated to Prof. X. Q. Wu for constructive suggestions.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Environmental Corrosion Center, Institute of Metal ResearchChinese Academy of SciencesShenyangP.R. China
  2. 2.Shenyang National Laboratory for Material Science, Institute of Metal ResearchChinese Academy of SciencesShenyangP.R. China

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