Design of Stable Nanocrystalline Alloys
Author(s)Chookajorn, Tongjai; Murdoch, Heather Ann; Schuh, Christopher A.
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Nanostructured metals are generally unstable; their grains grow rapidly even at low temperatures, rendering them difficult to process and often unsuitable for usage. Alloying has been found to improve stability, but only in a few empirically discovered systems. We have developed a theoretical framework with which stable nanostructured alloys can be designed. A nanostructure stability map based on a thermodynamic model is applied to design stable nanostructured tungsten alloys. We identify a candidate alloy, W-Ti, and demonstrate substantially enhanced stability for the high-temperature, long-duration conditions amenable to powder-route production of bulk nanostructured tungsten. This nanostructured alloy adopts a heterogeneous chemical distribution that is anticipated by the present theoretical framework but unexpected on the basis of conventional bulk thermodynamics.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
American Association for the Advancement of Science (AAAS)
Chookajorn, T., H. A. Murdoch, and C. A. Schuh. “Design of Stable Nanocrystalline Alloys.” Science 337, no. 6097 (August 23, 2012): 951-954.
Author's final manuscript