Abstract
A commercial magnesium alloy was processed through multi-pass and multi-directional (unidirectional, reverse, and transverse tool movements) friction stir processing (FSP). Based on the FSP location, the dominant prior-deformation basal texture was shifted along the arc of a hypothetical ellipse. The patterns of deformation texture developments were captured by viscoplastic self-consistent modeling with appropriate velocity gradients. The simulated textures, however, had two clear deficiencies. The simulations involved shear strains of 0.8 to 1.0, significantly lower than those expected in the FSP. Even at such low shear, the simulated textures were significantly stronger. Microstructural observations also revealed the presence of ultra-fine grains with relatively weak crystallographic texture. Combinations of ultra-fine grain superplasticity followed by grain coarsening were proposed as the possible mechanism for the microstructural evolution during FSP.
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Acknowledgments
The authors would like to acknowledge the use of the National Facility of Texture & OIM, IIT Bombay (a DST-IRPHA facility) for this study. The financial support from Naval Research Board (India) is also acknowledged. The authors also greatly acknowledge access to the Transmission Electron Microscopy facility of the Monash Centre for Electron Microscopy (MCEM).
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Manuscript submitted November 20, 2014.
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Tripathi, A., Tewari, A., Kanjarla, A.K. et al. Microstructural Evolution During Multi-Pass Friction Stir Processing of a Magnesium Alloy. Metall Mater Trans A 47, 2201–2216 (2016). https://doi.org/10.1007/s11661-016-3403-0
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DOI: https://doi.org/10.1007/s11661-016-3403-0