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: Contribution to journalArticle

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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.

    Original languageEnglish (US)
    Pages (from-to)1889-1904
    Number of pages16
    JournalActa Materialia
    Volume60
    Issue number4
    DOIs
    StatePublished - Feb 2012

    Profile

    Acetanilides
    Carbamyl Phosphate
    Temperature
    Twinning
    Creep
    Common Bile Duct Diseases
    Protamine Kinase
    Automobiles
    Shear stress
    Anisotropy
    Experiments
    Cinanserin
    Tensile stress
    Electron diffraction
    Yield stress
    Grain boundaries
    Electron microscopes
    Scanning
    Plasticity

    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: Contribution to journalArticle

    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, Vol. 60, No. 4, 02.2012, p. 1889-1904.

    Research output: Contribution to journalArticle

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