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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 408347, 7 pages
http://dx.doi.org/10.1155/2013/408347
Research Article

Misfit in Inconel-Type Superalloy

1Nuclear Physics Institute, ASCR, 25068 Řež, Czech Republic
2Institute of Physics of Materials, ASCR, Žižkova 22, 61662 Brno, Czech Republic
3TESCAN ORSAY HOLDING, a.s., Libušina tř. 21, 62300 Brno, Czech Republic
4Materials Science and Simulation, ASQ/NUM, PSI, 5232 Villigen, Switzerland
5CEITEC IPM, Institute of Physics of Materials, ASCR, 61662 Brno, Czech Republic

Received 22 August 2013; Revised 21 November 2013; Accepted 27 November 2013

Academic Editor: Debashis Mukherji

Copyright © 2013 Pavel Strunz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An important parameter for the characterization of microstructural changes in nickel base superalloys is the misfit - the relative difference between lattice parameters of matrix and precipitates. The misfit in IN738LC superalloy was examined at POLDI time-of-flight (TOF) neutron diffractometer both at room temperature and in situ at elevated temperatures using a high-temperature furnace. A careful out-of-furnace measurement yielded the lattice parameters of both and phase at room temperature (  Å,  Å) as well as the misfit (equal to ). The in situ measurement at elevated temperatures provided the temperature dependence of the lattice parameters of (up to 1120°C) and (up to 1000°C). Using these data, the evolution of the misfit with temperature was calculated. The misfit decreases with increasing temperature until it reaches zero value at a temperature around 800°C. Above 800°C, it becomes negative.