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Loss of strength in Ni3Al at elevated temperatures

Viguier, Bernard and Kruml, T. and Martin, J. L. Loss of strength in Ni3Al at elevated temperatures. (2006) Philosophical Magazine, vol. 86 (n° 25 - 26). pp. 4009-4021. ISSN 1478-6435

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Official URL: http://dx.doi.org/10.1080/14786430500522610

Abstract

Stress decrease above the stress peak temperature (750 K) is studied in h123i single crystals of Ni3(Al, 3 at.% Hf ). Two thermally activated deformation mechanisms are evidenced on the basis of stress relaxation and strain rate change experiments. From 500 to 1070 K, the continuity of the activation volume/temperature curves reveals a single mechanism of activation enthalpy 3.8 eV/atom and volume 90 b3 at 810K with an athermal stress of 330 MPa. Over the very same temperature interval, impurity or solute diffusion towards dislocation cores is evidenced through serrated yielding, peculiar shapes of stress–strain curves while changing the rate of straining and stress relaxation experiments. This complicates the identification of the deformation mechanism, which is likely connected with cube glide. From 1070 to 1270 K, the high-temperature mechanism has an activation enthalpy and volume of 4.8 eV/atom and 20 b3, respectively, at 1250 K.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Academy of Sciences (CZECH REPUBLIC)
Other partners > Ecole Polytechnique Fédérale de Lausanne - EPFL (SWITZERLAND)
Laboratory name:
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Deposited By: Celine Cabaup

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