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The Effects of Nanostructure on the Strengthening of NiAl

Published online by Cambridge University Press:  10 February 2011

T. Chen ,
N. N. Thadhani  and
J. M. Hampikian
T. Chen
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
N. N. Thadhani
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
J. M. Hampikian
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
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Abstract

The relationship between microhardness and grain size was investigated for nanocrystalline and coarse-grained stoichiometric intermetallic NiAl. The nanocrystalline NiAl specimens were synthesized through mechanical alloying with a high-energy Spex 8000 shaker mill and consolidated by shock compaction at a peak pressure of 4–6 GPa, to 83% dense compacts. The nanocrystalline NiAl compacts were also sintered at 1073, 1173 and 1473 K for 2 h. The Vickers hardness of consolidated and sintered NiAl was determined by microhardness testing, and the grain size and microstructure were investigated with transmission electron microscopy. It was found that the hardness values increased with decreasing grain size of the NiAl alloy. The Vickers hardness values were approximately 650±16, 690±6, 800±43 HV, respectively for NiAl with grain-sizes corresponding to approximately 27±18, 11±6 and 9±6 nm. The possible strengthening mechanisms operating in NiAl are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.3.1
Copyright
Copyright © Materials Research Society 1999

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