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The effect of the microstructure on elastic properties of a polycrystalline stoichiometric NiAl

  • Przemysław Witczak and Zbigniew Witczak
Published/Copyright: June 11, 2013

Abstract

Elastic constants for a polycrystalline stoichiometric NiAl intermetallic obtained via different processing routes were measured using ultrasonic methods. Samples having various porosity, (0 – 0.1), texture, and 0.2 – 200 μm grain size were produced by combined operations of casting or self-sustaining high-temperature synthesis, followed by hot hydrostatic extrusion and/or hot isostatic pressing. It was shown that the bulk modulus, as a quantity independent of crystallographic texture, depends on porosity according to an exponential relationship. Elastic properties of near theoretical density materials having various grain sizes were measured under high hydrostatic pressure ranging up to 1 GPa. Parameters of the equation of state were determined. The values of bulk moduli and their first pressure derivatives for the nanostructured material under investigation and of single crystals appeared to be the same.


* Correspondence address, Dr. Zbigniew Witczak Institute of High Pressure Physics Polish Academy of Sciences ul. Sokolowska 29/37, PL-01-141 Warszawa, Poland Tel.: +48 022 888 00 72 Fax: +48 022 632 42 18 E-mail:

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Received: 2008-9-4
Accepted: 2009-4-2
Published Online: 2013-06-11
Published in Print: 2009-06-01

© 2009, Carl Hanser Verlag, München

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