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Full-density nanocrystalline Fe–29Al–2Cr intermetallic consolidated from mechanically milled powders

Published online by Cambridge University Press:  31 January 2011

L. He  and
E. Ma
L. He
Affiliation:
Department of Mechanical Engineering, Materials Science and Engineering Program, Louisiana State University, Baton Rouge, Louisiana 70803
E. Ma
Affiliation:
Department of Mechanical Engineering, Materials Science and Engineering Program, Louisiana State University, Baton Rouge, Louisiana 70803
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Abstract

Fe–29Al–2Cr powders with nanoscale grain sizes were produced by mechanical milling of prealloyed intermetallic powders. A consolidation procedure employing high-pressure, low strain rate hot forging (sinter-forging) has been developed to consolidate the powders into full-density compacts. The relative density and average grain size of the compact have been studied as a function of consolidation temperature at constant pressure. Fully dense compacts (>99.5% theoretical density) were produced at a relatively low temperature of 545°C with a pressure of 1.25 GPa. Transmission electron microscopy and x-ray diffraction analysis indicate that the average grain size has been maintained to the order of 30 nm in samples consolidated under these conditions. By using protective Ar atmosphere during mechanical milling and consolidation, contamination of oxygen and carbon in consolidated samples has been controlled to below a small fraction of an atomic percent. Microhardness tests of nanocrystalline Fe–29Al–2Cr samples indicate a significant strengthening effect due to grain size refinement and a monotonic hardness increase with decreasing residual porosity. Our work demonstrates the feasibility of using mechanically milled powders as the source of nanocrystalline materials for the production of fully dense, low-impurity, nanocrystalline bulk samples needed for reliable mechanical property measurements and practical applications.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 72 - 80
Copyright
Copyright © Materials Research Society 1996

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