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The Effects of Grain Size and Texture on Dynamic Abnormal Grain Growth in Mo

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Abstract

This is the first report of abnormal grain morphologies specific to a Mo sheet material produced from a commercial-purity arc-melted ingot. Abnormal grains initiated and grew during plastic deformation of this material at temperatures of 1793 K and 1813 K (1520 °C and 1540 °C). This abnormal grain growth during high-temperature plastic deformation is termed dynamic abnormal grain growth, DAGG. DAGG in this material readily consumes nearly all grains near the sheet center while leaving many grains near the sheet surface unconsumed. Crystallographic texture, grain size, and other microstructural features are characterized. After recrystallization, a significant through-thickness variation in crystallographic texture exists in this material but does not appear to directly influence DAGG propagation. Instead, dynamic normal grain growth, which may be influenced by texture, preferentially occurs near the sheet surface prior to DAGG. The large grains thus produced near the sheet surface inhibit the subsequent growth of the abnormal grains produced by DAGG, which preferentially consume the finer grains near the sheet center. This produces abnormal grains that span the sheet center but leave unconsumed polycrystalline microstructure near the sheet surface. Abnormal grains are preferentially oriented with the \(\left\langle 110\right\rangle \) approximately along the tensile axis. These results provide additional new evidence that boundary curvature is the primary driving force for DAGG in Mo.

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Acknowledgments

The authors gratefully acknowledge support from the National Science Foundation for this work under Grants DMR-1105468 and DMR-1507417 and for equipment acquired under DMR-9974476. The authors extend special thanks to Dr. James Ciulik for significant technical contributions to this study. The FEI XL30 ESEM used in this work is from the Department of Geological Sciences, the University of Texas at Austin.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The University of Texas at Austin, 204 East Dean Keeton St. Stop C2200, Austin, TX, 78712-1591, USA

    Philip J. Noell (Professor) & Eric M. Taleff (Postdoctoral Fellow)

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  1. Philip J. Noell
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  2. Eric M. Taleff
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Correspondence to Philip J. Noell.

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Manuscript submitted March 30, 2016.

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Noell, P.J., Taleff, E.M. The Effects of Grain Size and Texture on Dynamic Abnormal Grain Growth in Mo. Metall Mater Trans A 47, 5023–5036 (2016). https://doi.org/10.1007/s11661-016-3644-y

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