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The Serrated Flow Behavior of Mg-Gd(-Mn-Sc) Alloys

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Abstract

The tensile deformation behavior of extruded samples of Mg-0.8 pct Gd and Mg-0.8 pct Gd-0.5 pct Mn-0.45 pct Sc (at. pct) alloys has been studied. Both alloys exhibit serrated flow when they are tensile tested at temperatures ranging from 150 °C to 300 °C and at strain rates of 1.67 × 10−4 s−1 to 1.67 × 10−2 s−1, and this serrated flow behavior is significantly affected by postextrusion heat treatments. Combined with observations made by transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP), the serrated flow is attributed to dynamic interactions between solute atoms and gliding dislocations. It is suggested that Gd atoms in the solid solution matrix of magnesium are mainly responsible for the serrations in the two alloys. The additions of Mn and Sc to the Mg-Gd alloy strengthen the dynamic solute-dislocation interactions and lead to a lower critical strain and larger stress drops of the serrated flow in the Mg-Gd-Mn-Sc alloy.

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Acknowledgments

The authors gratefully acknowledge the financial support from the Engineering Faculty, Monash University, and access to the facilities in the Monash Centre for Electron Microscopy. One of the authors (XYF) also gratefully acknowledges the financial support from the China Scholarship Council.

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Authors and Affiliations

  1. Department of Materials Engineering, Monash University, Victoria, 3800, Australia

    X. Y. Fang (Postgraduate Student) & J. F. Nie (Professor)

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, P.R. China

    X. Y. Fang (Postgraduate Student) & D. Q. Yi (Professor)

Authors
  1. X. Y. Fang
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  2. D. Q. Yi
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  3. J. F. Nie
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Correspondence to J. F. Nie.

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Manuscript submitted March 22, 2009.

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Fang, X.Y., Yi, D.Q. & Nie, J.F. The Serrated Flow Behavior of Mg-Gd(-Mn-Sc) Alloys. Metall Mater Trans A 40, 2761–2771 (2009). https://doi.org/10.1007/s11661-009-9967-1

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