(1.Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China) (2.School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China)
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DOI:
10.7502/j.issn.1674-3962.2016.03.08
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Abstract:
The phenomenon of plastic instability or PortevinLe Chatelier (PLC) effect showing a serrated wave on the stressstrain curve and accompanied with the propagation of strain localization in space can widely occur in many metal materials and induce sags and crests on the surface of materials during serrated flow, resulting in a degradation of the whole plasticity. On the basis of its spacetime characteristics, the serrated wave can be divided into A, B and C types. At present, it mainly exists two main theoretical models, i.e. dynamic strain aging (DSA) and dislocation cutting mechanism for the explanation of the PLC effect. In this paper, the emphasis will be put on the research progress of the PLC effect occurred in the traditional metal materials. Moreover, the recent research work about effects of microstructure, strain rate, stress state and micro mechanism on the PLC effect of metallic materials are reviewed and concluded. Finally, the existing problems in the current study, the research emphasis，direction in the future are also pointed out.