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Influence of Welding Temperature on Material Flow During Friction Stir Welding of AZ31 Magnesium Alloy

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Abstract

In this work, the effect of welding temperature on material flow during friction stir welding (FSW) of AZ31 magnesium alloy was examined. To this end, FSW was conducted in the temperature range of 0.65-0.85 Tm (Tm is the melting point) and sample-scale EBSD mapping was employed to characterize texture distribution. Despite that the low-temperature welds contained macro-scale defects (which presumably affected material flow), several important observations were made. In the entire temperature range, the global material motion was shown to consist of two principal components, viz. shoulder-induced flow and probe-induced flow. In some cases, however, a synergetic effect of these two constituents resulted in transitional orientation of macro-scale shear plane thus giving rise to a transitional material flow. During low-temperature FSW, the global material transportation was dominated by the probe. However, the contribution of the shoulder and transitional components was found to increase with welding temperature. This effect was attributed to the dominant role of the shoulder in generation of FSW heat. Above ~ 0.8 Tm, however, the transitional material flow was found to abruptly disappear. This result was associated with reduction of temperature sensitivity of flow stresses and the resulting equilibration of their distribution within the stir zone.

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Notes

  1. Here and hereafter, a reader is referred to on-line version of this paper to see figures in color.

  2. The textural data shown in these figures were derived from the regions numbered in Figures 5(b) and (c), respectively.

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No potential conflict of interest was reported by the authors.

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Authors and Affiliations

  1. Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki-aza-Aoba, Sendai, 980-8579, Japan

    Y. S. Sato & H. Kokawa

  2. Belgorod National Research University, Pobeda 85, Belgorod, Russia, 308015

    S. Mironov

  3. School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, P. R. China

    H. Kokawa

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  1. S. Mironov
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  2. Y. S. Sato
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  3. H. Kokawa
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Manuscript submitted November 4, 2018.

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Mironov, S., Sato, Y.S. & Kokawa, H. Influence of Welding Temperature on Material Flow During Friction Stir Welding of AZ31 Magnesium Alloy. Metall Mater Trans A 50, 2798–2806 (2019). https://doi.org/10.1007/s11661-019-05194-0

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  • DOI: https://doi.org/10.1007/s11661-019-05194-0

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