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Powder-Route Synthesis and Mechanical Testing of Ultrafine Grain Tungsten Alloys

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Abstract

We report a W-rich alloy (W-7Cr-9Fe, at. pct) produced by high-energy ball milling, with alloying additions that both lower the densification temperature and retard grain growth. The alloy’s consolidation behavior and the resultant compacts’ microstructure and mechanical properties are explored. Under one condition, a 98 pct dense compact with a mean grain size of 130 nm was achieved, and exhibited a hardness of 13.5 GPa, a dynamic uniaxial yield strength of 4.14 GPa in Kolsky bar experiments, and signs of structural shear localization during deformation.

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Acknowledgments

This study was supported by the US Defense Threat Reduction Agency under Grant No. HDTRA1-11-1-0062. ZCC acknowledges support from the Department of Defense through the NDSEG fellowship program. ELH acknowledges support from the US Army Research Laboratory through the Oak Ridge Institute for Space and Education (ORISE) Program # 1120-1120-99. BES would like to acknowledge support work from the Cooperative Research and Development Agreement #11-24. We would like to thank Ms. Alexandria Will-Cole for her indentation work on the intermetallic phase, Dr. Kisub Cho for performing the THERMOCALC calculations, and Dr. Daniel T. Casem for his assistance with the Kolsky bar tests.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, MIT, Cambridge, MA, 02139, USA

    Zachary C. Cordero (Graduate Student), Mansoo Park (Graduate Student) & Christopher A. Schuh (Professor, Department Head)

  2. Oak Ridge Institute for Science and Education Postdoctoral Fellowship Program, Army Research Laboratory, Aberdeen Proving Ground, MD, 21005, USA

    Emily L. Huskins (Postdoctoral Fellow)

  3. Department of Materials Science & Engineering, Boise State University, Boise, ID, 83725, USA

    Steven Livers (Graduate Student) & Megan Frary (Associate Professor)

  4. Experimental and Computational Penetration Mechanics Team, Weapons and Materials Research Directorate, Army Research Laboratory, Aberdeen Proving Ground, MD, 21005, USA

    Brian E. Schuster (Mechanical Engineer, Team Leader)

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  1. Zachary C. Cordero
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Correspondence to Christopher A. Schuh.

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Manuscript submitted November 6, 2013.

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Cordero, Z.C., Huskins, E.L., Park, M. et al. Powder-Route Synthesis and Mechanical Testing of Ultrafine Grain Tungsten Alloys. Metall Mater Trans A 45, 3609–3618 (2014). https://doi.org/10.1007/s11661-014-2286-1

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