The role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in two-phase γ/γ′ superalloys

Yu N. Gornostyrev; O. Yu Kontsevoi; K. Yu Khromov; M. I. Katsnelson; A. J. Freeman

doi:10.1016/j.scriptamat.2006.10.002

The role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in two-phase γ/γ′ superalloys

Yu N. Gornostyrev, O. Yu Kontsevoi^*, K. Yu Khromov, M. I. Katsnelson, A. J. Freeman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

The relative role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in γ/γ′ alloys was investigated on the basis of ab initio calculations. We show that over a wide temperature range, up to approximately 0.6T_melt, the lattice misfit is determined by the difference in thermal expansion of γ and γ′ phases and exhibits 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.

Original language	English (US)
Pages (from-to)	81-84
Number of pages	4
Journal	Scripta Materialia
Volume	56
Issue number	2
DOIs	https://doi.org/10.1016/j.scriptamat.2006.10.002
State	Published - Jan 2007

Funding

We thank Y. Mishin for stimulating discussions and E.I. Isaev for help with generating a pseudopotential for Nb. This work was supported by the AFOSR under grant FA9550-04-1-0013, by computer time grants at NAVO, ARSC and MHPCC, and in part by the Netherlands Organization for Scientific Research (NWO project 47.016.005).

Keywords

Ab initio electron theory
Lattice misfit
Nickel alloys
Platinum group metals
Thermally activated processes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2006.10.002

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title = "The role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in two-phase γ/γ′ superalloys",

abstract = "The relative role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in γ/γ′ alloys was investigated on the basis of ab initio calculations. We show that over a wide temperature range, up to approximately 0.6Tmelt, the lattice misfit is determined by the difference in thermal expansion of γ and γ′ phases and exhibits 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 = "Ab initio electron theory, Lattice misfit, Nickel alloys, Platinum group metals, Thermally activated processes",

author = "Gornostyrev, {Yu N.} and Kontsevoi, {O. Yu} and Khromov, {K. Yu} and Katsnelson, {M. I.} and Freeman, {A. J.}",

note = "Funding Information: We thank Y. Mishin for stimulating discussions and E.I. Isaev for help with generating a pseudopotential for Nb. This work was supported by the AFOSR under grant FA9550-04-1-0013, by computer time grants at NAVO, ARSC and MHPCC, and in part by the Netherlands Organization for Scientific Research (NWO project 47.016.005). ",

year = "2007",

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AU - Gornostyrev, Yu N.

AU - Kontsevoi, O. Yu

AU - Khromov, K. Yu

AU - Katsnelson, M. I.

AU - Freeman, A. J.

N1 - Funding Information: We thank Y. Mishin for stimulating discussions and E.I. Isaev for help with generating a pseudopotential for Nb. This work was supported by the AFOSR under grant FA9550-04-1-0013, by computer time grants at NAVO, ARSC and MHPCC, and in part by the Netherlands Organization for Scientific Research (NWO project 47.016.005).

PY - 2007/1

Y1 - 2007/1

N2 - The relative role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in γ/γ′ alloys was investigated on the basis of ab initio calculations. We show that over a wide temperature range, up to approximately 0.6Tmelt, the lattice misfit is determined by the difference in thermal expansion of γ and γ′ phases and exhibits 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.

AB - The relative role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in γ/γ′ alloys was investigated on the basis of ab initio calculations. We show that over a wide temperature range, up to approximately 0.6Tmelt, the lattice misfit is determined by the difference in thermal expansion of γ and γ′ phases and exhibits 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.

KW - Ab initio electron theory

KW - Lattice misfit

KW - Nickel alloys

KW - Platinum group metals

KW - Thermally activated processes

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The role of thermal expansion and composition changes in the temperature dependence of the lattice misfit in two-phase γ/γ′ superalloys

Abstract

Funding

Keywords

ASJC Scopus subject areas

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