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.
Original language | English (US) |
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Pages (from-to) | 81-84 |
Number of pages | 4 |
Journal | Scripta Materialia |
Volume | 56 |
Issue number | 2 |
DOIs | |
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