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Room temperature deformation mechanisms of Mg/Nb nanolayered composites

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Abstract

In this work, the deformation mechanisms underlying the room temperature deformation of the pseudomorphic body centered cubic (BCC) Mg phase in Mg/Nb nanolayered composites are studied. Nanolayered composites comprised of 50% volume fraction of Mg and Nb were synthesized using physical vapor deposition with the individual layer thicknesses h of 5, 6.7, and 50 nm. At the lower layer thicknesses of h = 5 and 6.7 nm, Mg has undergone a phase transition from HCP to BCC such that it formed a coherent interface with the adjoining Nb phase. Micropillar compression testing normal and parallel to the interface plane shows that the BCC Mg nanolayered composite is much stronger and can sustain higher strains to failure than the HCP Mg nanolayered composite. A crystal plasticity model incorporating confined layer slip is presented and applied to link the observed anisotropy and hardening in the deformation response to the underlying slip mechanisms.

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ACKNOWLEDGMENTS

M.A., M.K., M.J., and S.P., acknowledge funding from the National Science Foundation (NSF) - Civil, Mechanical and Manufacturing Innovation (CMMI) Early Concept Grants for Exploratory Research (EAGER) Grant No. 1541918. I.J.B. gratefully acknowledges support from a CMMI-MEP Grant No. 1727495. S.P. would also like to gratefully acknowledge support from the University of Nevada, Reno Research Enhancement Grant 2017 for this work. A.K. would like to acknowledge LANL LDRD Program No. 20170680ER for financial support. We acknowledge support from the Center for Scientific Computing from the CNSI, MRL: an NSF MRSEC (DMR-1121053). Part of the research was performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy, Office of Science. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under Contract No. DE-AC52-06NA25396. The authors acknowledge M. Jahedi for XRD texture measurements.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of New Hampshire, Durham, New Hampshire, 03824, USA

    Milan Ardeljan & Marko Knezevic

  2. Chemical and Materials Engineering, University of Nevada, Reno, Nevada, 89557, USA

    Manish Jain & Siddhartha Pathak

  3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

    Anil Kumar

  4. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

    Nan Li, Nathan A. Mara & J. Kevin Baldwin

  5. Mechanical Engineering Department, Materials Department, University of California at Santa Barbara, Santa Barbara, California, 93106, USA

    Irene J. Beyerlein

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Ardeljan, M., Knezevic, M., Jain, M. et al. Room temperature deformation mechanisms of Mg/Nb nanolayered composites. Journal of Materials Research 33, 1311–1332 (2018). https://doi.org/10.1557/jmr.2018.107

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