In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31

C. J. Boehlert, Z. Chen, I. Gutiérrez-Urrutia, J. Llorca, M. T. Pérez-Prado

    Research output: Research - peer-reviewArticle

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    Abstract

    A rolled AZ31 alloy was tensile tested in a scanning electron microscope at 323 K (50 °C), 423 K (150 °C), and 523 K (250 °C) in order to analyze the deformation mechanisms in situ. Electron backscatter diffraction was performed both before and after straining. There was a significant difference in the activity of the various deformation modes at the three test temperatures and the mechanical anisotropy was considerably reduced with temperature. At 323 K (50 °C) extension twinning, basal, prismatic 〈a〉, and pyramidal 〈c+a〉 slip were active. Twinning disappeared above 323 K (50 °C), suggesting that the critical resolved shear stress (CRSS) of non-basal systems becomes less than that of twinning at T <423 K (150 °C). Plasticity was controlled at high temperature by a combination of basal and prismatic 〈a〉 slip. From 423 K (150 °C) to 523 K (250 °C), a transition occurs in the dominant deformation mechanism from basal + prismatic 〈a〉 to mainly prismatic 〈a〉 slip. This is consistent with a decrease of the CRSS of non-basal slip systems with increasing temperature. These results suggest that the observed drop in normal anisotropy with increasing temperature is likely to be the consequence of an increase in non-basal slip activity. In situ tensile-creep experiments, performed at approximately the yield stress at 423 K (150 °C), indicated that less slip and more grain boundary cracking occurs during creep deformation compared with the higher-stress tensile experiments.

    LanguageEnglish (US)
    Pages1889-1904
    Number of pages16
    JournalActa Materialia
    Volume60
    Issue number4
    DOIs
    StatePublished - Feb 2012

    Profile

    Creep
    Temperature
    Twinning
    Shear stress
    Anisotropy
    Experiments
    Tensile stress
    Electron diffraction
    Plasticity
    Yield stress
    Grain boundaries
    Electron microscopes
    Scanning
    Mg-Al-Zn-Mn-Si-Cu alloy

    Keywords

    • Creep
    • Microstructure
    • Slip
    • Tensile
    • Twinning

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Metals and Alloys
    • Polymers and Plastics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Boehlert, C. J., Chen, Z., Gutiérrez-Urrutia, I., Llorca, J., & Pérez-Prado, M. T. (2012). In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31. Acta Materialia, 60(4), 1889-1904. DOI: 10.1016/j.actamat.2011.10.025

    In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31. / Boehlert, C. J.; Chen, Z.; Gutiérrez-Urrutia, I.; Llorca, J.; Pérez-Prado, M. T.

    In: Acta Materialia, Vol. 60, No. 4, 02.2012, p. 1889-1904.

    Research output: Research - peer-reviewArticle

    Boehlert, CJ, Chen, Z, Gutiérrez-Urrutia, I, Llorca, J & Pérez-Prado, MT 2012, 'In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31' Acta Materialia, vol 60, no. 4, pp. 1889-1904. DOI: 10.1016/j.actamat.2011.10.025
    Boehlert CJ, Chen Z, Gutiérrez-Urrutia I, Llorca J, Pérez-Prado MT. In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31. Acta Materialia. 2012 Feb;60(4):1889-1904. Available from, DOI: 10.1016/j.actamat.2011.10.025
    Boehlert, C. J. ; Chen, Z. ; Gutiérrez-Urrutia, I. ; Llorca, J. ; Pérez-Prado, M. T./ In situ analysis of the tensile and tensile-creep deformation mechanisms in rolled AZ31. In: Acta Materialia. 2012 ; Vol. 60, No. 4. pp. 1889-1904
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