Design of stable nanocrystalline alloys

Tongjai Chookajorn, Heather A. Murdoch, Christopher A. Schuh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

741 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)951-954
Number of pages4
JournalScience
Volume337
Issue number6097
DOIs
StatePublished - Aug 24 2012

ASJC Scopus subject areas

  • General

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