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Role of Thermal Expansion and Redistribution of Components on the Temperature Dependence of the Lattice Misfit in γ/γ' Superalloys

Published online by Cambridge University Press:  26 February 2011

Oleg Kontsevoi ,
Yuri N. Gornostyrev  and
Arthur J. Freeman
Oleg Kontsevoi
Affiliation:
ok@mars.phys.northwestern.edu, Northwestern University, Physics & Astronomy, 2145 N. Sheridan Rd., Evanston, IL, 60208, United States, (847)491-8637, (847)491-5082
Yuri N. Gornostyrev
Affiliation:
yug@pluto.phys.northwestern.edu, Northwestern University, Physics & Astronomy, 2145 N. Sheridan Rd., Evanston, IL, 60208, United States
Arthur J. Freeman
Affiliation:
art@freeman.phys.northwestern.edu, Northwestern University, Physics & Astronomy, 2145 N. Sheridan Rd., Evanston, IL, 60208, United States
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Abstract

The relative role of thermal expansion and redistribution of alloy components in the temperature dependence of the lattice misfit in γ/γ' alloys is investigated on the basis of ab initio calculations. We show that in a wide temperature region up to approximately 0.6·Tmelt, the lattice misfit is determined by the difference in thermal expansion of γ and γ' phases and shows only a slight variation. For higher temperatures the redistribution of the major alloy components between the phases becomes a leading contribution to the lattice misfit.

Keywords

alloyNithermal stresses
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II08-10
Copyright
Copyright © Materials Research Society 2007

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