Minimizing serrated flow in Al-Mg alloys by electroplasticity

doi:10.1016/j.jmst.2018.12.007

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (6): 1108-1112.DOI: 10.1016/j.jmst.2018.12.007

收稿日期:2018-10-23 接受日期:2018-11-24 出版日期:2019-06-20 发布日期:2019-06-19

Minimizing serrated flow in Al-Mg alloys by electroplasticity

Hui Xu^a, Xuebing Liu^a, Di Zhang^b, Xinfang Zhang^a^*()

^aSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
^bState 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.

摘要/Abstract

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

. [J]. 材料科学与技术, 2019, 35(6): 1108-1112.

Hui Xu, Xuebing Liu, Di Zhang, Xinfang Zhang. Minimizing serrated flow in Al-Mg alloys by electroplasticity[J]. J. Mater. Sci. Technol., 2019, 35(6): 1108-1112.

图/表 5

Fig. 1. (a) Stress-strain curves at different current intensities. For a better view, the curves are separated by an interval of 30 MPa. (b) The magnified diagram of (a). (c) The critical strain vs current intensity. (d) Waiting time vs current intensity.

Fig. 2. Statistics of stress drops, (a) non-pulsed, (b) 50 A, (c) 100 A, and (d) 150 A.

Fig. 3. (a) Temperature measured by infrared thermal imaging camera for the pulsed sample at 200 A indicates the maximum temperature of 35 °C, while the thermocouple indicates the maximum temperature of 40 °C. (b) Stress-strain curves at different temperatures. For a better view, the curves are separated by an interval of 30 MPa.

Fig. 4. Dislocations in the investigated samples detected by TEM, (a) no-pulsed, (b) 100 A, (c) 150 A, (d) 200 A, (e) the function image of FWHM and 2θ, and (f) the dislocation density.

Fig. 5. (a) Function image of FWHM and 2θ, and (b) the calculated dislocation density.

Minimizing serrated flow in Al-Mg alloys by electroplasticity

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