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Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material

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Abstract

The roles of subgrains, texture, and surface energy during dynamic abnormal grain growth (DAGG) were examined in a commercial-purity Mo rod material. DAGG was observed in this material during tensile deformation at 2023 K (1750 °C). Cooling of specimens after tensile testing was sufficiently rapid to preserve both subgrain structures developed during deformation and several abnormal grains at early stages of growth. These and other microstructural features were characterized to evaluate how subgrains and boundary character influence the early stages of DAGG. Subgrains were observed in the deformed polycrystalline material but were generally absent in newly formed abnormal grains. This was identified as the cause of the sudden drop in flow stress observed at the initiation of DAGG. It is proposed that subgrain intersections with abnormal grain boundaries provide a driving pressure for DAGG. Subgrains within the deformed polycrystals were observed to locally change the boundary curvature at their intersections with abnormal grain boundaries, which likely encouraged growth of the abnormal grains into the deformed polycrystals. Abnormal grains produced by DAGG retained crystallographic orientations and boundary characters that closely resembled those of the polycrystalline material from which they grew. This suggests that neither differences in orientation nor boundary character were important to DAGG in this material.

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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 also gratefully acknowledge H.C. Stark and Mr. Paul Aimone for generously providing the Mo rod material used for this study. The authors extend special thanks to Dr. Daniel Worthington for useful preliminary analysis of surface energy effects on DAGG initiation. The FEI XL30 ESEM and EBSD system used in this work is from the Department of Geological Sciences at the University of Texas at Austin. Sandia National Laboratories is a multi-mission laboratory managed and operated by the National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under Contract DE-NA0003525.

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Correspondence to Philip J. Noell.

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Manuscript submitted January 25, 2019.

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Noell, P.J., Taleff, E.M. Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material. Metall and Mat Trans A 50, 4608–4619 (2019). https://doi.org/10.1007/s11661-019-05370-2

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