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Effects of Solute and Second-Phase Particles on the Texture of Nd-Containing Mg Alloys

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Abstract

Hot-rolled, binary Mg-Nd alloys with compositions ≥0.095 at. pct undergo the texture weakening phenomenon that has been reported in a number of Mg–rare earth (RE) alloys. However, alloys with compositions ≤0.01 at. pct retain a strong basal texture typical of pure Mg and other Mg alloys. Measurements of intragranular misorientation axes obtained using electron backscatter diffraction (EBSD) show that more dilute alloys contain predominantly basal \( < a > \) dislocations, while richer alloys contain primarily prismatic \( < a > \) dislocations. It is suggested that this change in dislocation content is related to a change in the dynamic recrystallization (DRX) mechanism. Metastable second-phase Mg x Nd1–x intermetallic particles are present within the alloys, and an annealing study indicates that the alloys undergoing texture weakening have grain sizes well predicted by classical Zener drag theory. Even though the more dilute alloys also contain second-phase particles, they are not sufficient to induce pinning. The promotion of nonbasal slip and the reduction in grain boundary mobility due to Zener drag are suggested as controlling mechanisms that promote the observed texture weakening phenomena.

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Notes

  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  2. The possibility that pyramidal \( < c + a > \) dislocations are responsible for the \( < uvt0 > \) IGMA cannot be completely ruled out. However, it is viewed as less likely given the high activation stress of that mechanism.

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Acknowledgments

The National Science Foundation (Grant No. DMR-0603066) and Deutsche Forschungsgemeinschaft (Grant No. LE 1395/3-1) World Materials Network financially supported this research collaboration.

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Authors and Affiliations

  1. Materials Science and Engineering Department, University of Virginia, Charlottesville, VA, 22904-4745, USA

    Jason P. Hadorn (Postdoctoral Researcher) & Sean R. Agnew (Heinz and Doris Wilsdorf Distinguished Research Associate Professor of Materials Science and Engineering)

  2. Magnesium Innovation Center (MagIC), Helmholtz Centre Geesthacht, 21502, Geesthacht, Germany

    Kerstin Hantzsche (Graduate Research Assistant), Sangbong Yi (Scientist), Jan Bohlen (Scientist) & Dietmar Letzig (Head of Department)

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  1. Jason P. Hadorn
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Correspondence to Sean R. Agnew.

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Manuscript submitted March 14, 2010.

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Hadorn, J.P., Hantzsche, K., Yi, S. et al. Effects of Solute and Second-Phase Particles on the Texture of Nd-Containing Mg Alloys. Metall Mater Trans A 43, 1363–1375 (2012). https://doi.org/10.1007/s11661-011-1018-z

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