OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

TEM analysis of the deformation microstructure of polycrystalline cobalt plastically strained in tension

Martinez, Mayerling and Fleurier, Gwendoline and Chmelík, František and Knapek, Michal and Viguier, Bernard and Hug, Eric TEM analysis of the deformation microstructure of polycrystalline cobalt plastically strained in tension. (2017) Materials Characterization, 134. 76-83. ISSN 1044-5803

(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader

Official URL: https://doi.org/10.1016/j.matchar.2017.09.038


The microstructure evolution of hexagonal close-packed cobalt at different stages of work hardening has been studied. The deformation microstructure of polycrystalline samples upon a tension test was investigated by Transmission Electron Microscopy (TEM). Corresponding straining mechanisms were also identified by acoustic emission measurements. It was shown that dislocation glide is the predominant deformation mechanism during the first stage of plastic deformation, while twinning becomes the prominent strain accommodation mechanism in the later stage. A detailed TEM study using electron diffraction allowed identifying different types of twins activated during tensile testing. Four single twinning modes were identified, from which two types correspond to tensile strain and two types to compressive strain (with respect to the c direction), double twins were also observed. A relative importance of various systems is estimated and it is shown that the vast majority of twins correspond to the 101¯2 twinning system.

Item Type:Article
HAL Id:hal-02175446
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Charles University (CEZCH REPUBLIC)
Laboratory name:
Deposited On:13 Jan 2021 10:38

Repository Staff Only: item control page