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Microhardness Enhancement in Fully Dense Fe-Based Nanophase Metallic Alloys

Published online by Cambridge University Press:  15 February 2011

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

Nano-grained Fe-29Al-2Cr intermetallic and Fe-Cu two-phase composites have been consolidated to full density from powders produced by high-energy ball milling, using a sinter forging procedure developed recently in our laboratory. Grain sizes remained within nanophase range (<100 nm) after consolidation. Microhardness tests of Fe-29Al-2Cr samples consolidated to different density levels indicate a significant strengthening effect due to nanoscale grain size and a monotonic microhardness increase with decreasing residual porosity. Fully dense Fe-Cu composites exhibit enhanced microhardness as compared with rule-of-mixtures predictions, which may be attributable to interface strengthening at fcc-bcc interphase boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 299
Copyright
Copyright © Materials Research Society 1996

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