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Mechanical Properties of Nano-Scale Mechanically-Milled NiAl

Published online by Cambridge University Press:  15 February 2011

Timothy R. Smith
Timothy R. Smith*
Affiliation:
Institute for Mechanics and Materials, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0404.
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Abstract

This work reports on the mechanical properties of nanocrystalline NiAI materials. Mechanically- milled NiAl with and without Al2O3 additions was forged to 94% of the theoretical density of stoicheometric NiAl at < 0.5 Tm in air. Mechanical properties were investigated by microhardness measurements and the Miniaturized Disk-Bend Test (MDBT). Analysis of the hardness data indicates that most of the compression strengthening is due to the refined microstructure. MDBT results are consistent with tensile tests indicating that the tensile strength is controlled by the strength of grain boundaries.

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