J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 1108-1112.DOI: 10.1016/j.jmst.2018.12.007

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Minimizing serrated flow in Al-Mg alloys by electroplasticity

Hui Xua, Xuebing Liua, Di Zhangb, Xinfang Zhanga*()   

  1. a School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    b State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2018-10-23 Accepted:2018-11-24 Online:2019-06-20 Published:2019-06-19
  • Contact: Zhang Xinfang
  • About author:

    1 These authors contributed equally to this work.

Abstract:

Serrated flow under the influence of electroplasticity in Al-Mg alloys is investigated within the dynamic strain aging interpretations of the Portevin-Le Chatelier effect. The stability of plastic region is extended by the pulsed electric current with the increase of critical strain and the extension of waiting time. Meanwhile, the dislocation density, affecting the plastic instabilities due to the interaction between solute atoms and mobile dislocations, is greatly reduced, which plays a dominant role in the suppression of serrated flow.

Key words: Portevin-Le Chatelier effect, Dynamic strain aging, Dislocation, Electroplastic effect, Aluminum alloy