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The High Temperature Deformation Behavior of A Cr2Nb Ordered Intermetallic System

Published online by Cambridge University Press:  26 February 2011

G. E. Vignoul ,
J.M. Sanchez  and
J. K. Tien
G. E. Vignoul
Affiliation:
Strategic Materials R&D Laboratory, The University of Texas, Austin, Texas 78721
J.M. Sanchez
Affiliation:
Strategic Materials R&D Laboratory, The University of Texas, Austin, Texas 78721
J. K. Tien
Affiliation:
Strategic Materials R&D Laboratory, The University of Texas, Austin, Texas 78721
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Abstract

A basic characterization of the deformation behavior of Cr2Nb by microindention at ambient and elevated temperatures (up to 1400 °C) was undertaken. The microhardness of this system was seen to decrease with increasing temperature, from 1040 MPa at 25°C to 322 MPa at 1400 °C. Further, the microindention creep behavior of this system was studied by varying time on load at T = 1000 and 1200°C. Analysis of the data showed that m = 24 and Qapp = 477.61 kJ/mole. These unusually high values are indicative of the existence of an effective resisting stress against creep. When the data was fit against a microindention creep deformation law which was modified to incorporate an effective resisting stress term, it was determined that m = 4.5, Qcreep = 357 kJ/mole and the resisting stress term σr = 300 MPa.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 739
Copyright
Copyright © Materials Research Society 1991

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References

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