Macroscopic consequences of Piobert-Luders and Portevin-Le Chatelier bands during tensile deformation in Al-Mg alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:746

Article

Reyne, Baptiste^1,2  Manach, Pierre-Yves²  Moes, Nicolas¹ 

[1] Cent Nantes, GeM, 1 Rue Noe, F-44321 Nantes 3, France

[2] Univ Bretagne Sud, UMR CNRS 6027, IRDL, F-56100 Lorient, France

关键词: Characterization;    Aluminum alloys;    Plasticity;    Portevin-Le Chatelier;    Piobert-Luders;    Strain localization;   

DOI  :  10.1016/j.msea.2019.01.009

来源: Elsevier

【 摘 要 】

Luders bands and the Portevin-Le Chatelier effect are both due to plastic flow instabilities that affect a wide variety of metallic materials. The present study focuses on understanding these behaviors. Field kinematic measurements combined with the comparison of two specimen sizes are used here to characterize the Al-Mg alloy AA5086, by investigating the kinetics of individual localization bands. A unifying point of view is proposed for the classification of these bands together with the identification of a constitutive relation linking strain increments and nucleation stress, as well as evidence of the factors determining the development of serration behaviors. This leads to a novel interpretation of the spatiotemporal behavior of the bands as being the result of a competition between the influence of plastic strain and its gradient.

【 授权许可】

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