Bulk processing of high-performance nanocrystalline intermetallics
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R.C. Cammarataa) Department of Materials Science and Engineering and Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21212
C. Van Heerden and T.P. Weihs Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21212
C.L. Chien Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21212 (Received 28 May 2003; accepted 13 June 2003)
We present an inexpensive, bulk-processing technique for the mass fabrication of a high-performance, nanocrystalline intermetallic with no internal flaws: the recrystallization of plastically deformed ingots through controlled heat treatments. We demonstrate that FeCo alloys with average grain sizes of 100 nm can be produced using this method. The nanocrystalline materials have tensile yield strengths as high as 2.2 GPa and have plastic tensile ductilities over 1.3%. Such superior properties at room temperature are currently unattainable when nanocrystalline materials are prepared by other methods.
For more than a decade, researchers have pursued nanocrystalline materials for structural applications1,2 because materials with grain sizes
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