Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
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Liming Zhang
Abstract
The formation and thermal stability of φ phase in as-cast, annealed and very slowly cooled samples have been studied by means of X-ray diffraction, metallographic investigations, differential thermal analysis and magnetothermal analysis. The results of the combination of these data indicate that the φ phase forms from the β phase by a solid-state polymorphous reaction at 650 °C, it is thermodynamically stable below the formation temperature and can be in equilibrium with i, η, β, ε, and ω phases. On the other hand, an ordered β structure (β′) is found in as-cast and moderately cooled alloys, this metastability is characterized by a suppression of φ phase formation during cooling.
Abstract
Bildung und thermische Stabilität der φ-Phase im Guss-, angelassenen und langsam abgekühlten Zustand wurden mit Röntgenbeugung, metallographischen Untersuchungen, differentialthermischen und magnetothermischen Analysen untersucht. Die Ergebnisse aus der Kombination dieser Daten zeigen, dass die φ-Phase sich aus der ß-Phase in einer polymorphen Festkörperreaktion bei 650 °C bildet. Sie ist thermodynamisch stabil unterhalb dieser Temperatur und kann mit den Phasen i, η, β, ε und ω im Gleichgewicht stehen. Andererseits wurde im Gusszustand und in mäßig abgekühlten Legierungen eine geordnete β-Phase (β′) gefunden; diese Metastabilität wird durch die Unterdrückung der φ-Phasen-Bildung während der Abkühlung bestimmt.
Funding statement: Support of the Deutsche Foschungsgemeinschaft is gratefully acknowledged. The authors would like to express their gratitude to Prof. Dr. John W. Cahn (NIST) for valuable discussions and inspiration to undertake this study. Heartfelt thanks are to T. Gödecke for fruitful discussions and to Dr. D.H. Warrington for valuable comments on the manuscript. The experimental assistance of D. Lang, T. Acartürk, and T. Meisner is acknowledged.
References
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© 2003 Carl Hanser Verlag, München
Articles in the same Issue
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- Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
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- Notifications/Mitteilungen
- Personal/Personelles
- Gesellschaftsnachricht
- International Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles/Aufsätze
- The role of oxidation-induced cavities on the failure of the thermally grown oxide on binary β-NiAl alloys
- Phase stability of Y + Gd co-doped zirconia
- Mechanisms governing the distortion of alumina-forming alloys upon cyclic oxidation
- High-temperature oxidation of FeCrAl alloys: the effect of Mg incorporation into the alumina scale
- Nonlinear dielectric properties at oxide grain boundaries
- TEM observations of singular grain boundaries and their roughening transition in TiO2-excess BaTiO3
- Processing of dense MgO substrates for high-temperature superconductors
- Microwave-induced crystallization of polysilazane-derived silicon carbonitride
- Schottky barrier formation in liquid-phase-sintered silicon carbide
- SrTiO3: a model electroceramic
- Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate
- Spreading of liquid Ag and Ag–Mo alloys on molybdenum substrates
- Nanoalloying in mixed AgmAun nanowires
- Never ending saga of a simple boundary
- Comparison of interfacial chemistry at Cu/α-alumina and Cu/γ-alumina interfaces
- Microstructure of Cu2O/Si interfaces, made by epitaxial electrodeposition
- Metal/oxide interfaces and their reaction with hydrogen
- Amorphous films at metal/ceramic interfaces
- Some thoughts on source monochromation and the implications for electron energy loss spectroscopy
- Determination of the contrast transfer function by analysing diffractograms of thin amorphous foils
- Progress in the preparation of cross-sectional TEM specimens by ion-beam thinning
- Quantification of interfacial segregation by analytical electron microscopy
- Quantification of elemental segregation to lath and grain boundaries in low-alloy steel by STEM X-ray mapping combined with the ζ-factor method
- Microstructure of Al/Ti metallization layers
- Connectivity of CSL grain boundaries and the role of deviations from exact coincidence
- Effect of laser shock processing on the microstructure and mechanical properties of pure Cu
- Growth and microstructure of iron nitride layers and pore formation in ε-Fe3N
- Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
- Notifications/Mitteilungen
- Personal/Personelles
- Gesellschaftsnachricht
- International Conferences
