Experimental and thermodynamic assessment of the Fe –Gd–Zr system
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Matvei Zinkevich
,
Norbert Mattern
Abstract
The phase equilibria in the ternary system Fe –Gd – Zr at 1073 K have been investigated by X-ray diffraction and electron probe microanalysis. The isothermal section consists of terminal solution phases bcc (Fe), hcp (Zr), and hcp (Gd) (bcc = body-centred cubic, hcp = hexagonal close-packed), binary compounds FeZr2 and FeZr3, quasibinary compounds (Fe, Zr)17Gd2, Fe17(Gd, Zr)2, Fe23(Gd, Zr)6, Fe3(Gd, Zr), and Laves phase Fe2(Gd, Zr). No ternary compounds were detected. The isomorphous phases Fe23Gd6–Fe23Zr6 and Fe2Gd–Fe2Zr do not form continuous solid solutions. The Fe3(Gd, Zr) phase shows the largest homogeneity region (0–12 at.% Zr). In the compound Fe17Gd2, Zr atoms can substitute for both Gd and Fe atoms. This results in the formation of two distinct phases (hexagonal and rhombohedral), respectively. The experimental results have been used to obtain a self-consistent thermodynamic description of the ternary system Fe – Gd–Zr.
Abstract
Die Phasengleichgewichte im ternären System Fe –Gd – Zr bei 1073 K wurden mit Röntgenbeugung und Elektronenstrahlmikroanalyse untersucht. Der isotherme Schnitt besteht aus den Mischkristallen bcc (Fe), hcp (Zr), und hcp (Gd), den binären Verbindungen FeZr2 und FeZr3, den quasibinären Verbindungen (Fe, Zr)17Gd2, Fe17(Gd, Zr)2, Fe23(Gd, Zr)6, Fe3(Gd, Zr), und der Laves-Phase Fe2(Gd, Zr). Keine ternären Verbindungen wurden entdeckt. Die isomorphen Phasen Fe23Gd6–Fe23Zr6 und Fe2Gd–Fe2Zr bilden nicht kontinuierliche feste Lösungen. Die Fe3(Gd,Zr)-Phase zeigt den größten Homogenitätsbereich (0– 12 at.% Zr). In der Verbindung Fe17Gd2, können die Zr-Atome sowohl Gd- als auch Fe-Atome ersetzen. Dieses führt zur Bildung von zwei unterschiedlichen Phasen mit hexagonaler und rhomboedrischer Struktur. Die experimentellen Ergebnisse wurden benutzt, um eine selbstkonsistente thermodynamische Beschreibung des ternären Systems Fe –Gd–Zr zu erhalten.
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The authors wish to express their thanks to W. Gude, B. Opitz, A. Weckbrodt, B. Gebel, and H. Klose for technical assistance. Financial support of the Deutsche Forschungsgemeinschaft DFG (project Ma1531/5) is gratefully acknowledged.
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© 2002 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Articles/Aufsätze
- Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy
- Experimental and thermodynamic assessment of the Fe –Gd–Zr system
- Phase diagram of the Fe –Co –Ti system at 1073 K
- Copper concentration inside Guinier-Preston I zones formed in an Al –Cu alloy
- Identification of precipitates in 6013 aluminum alloy (Al –Mg –Si –Cu)
- Redistribution of phosphorus and carbon in steel weldments
- Microstructure and compressive properties of in situ synthesized TiC/Ti composites
- Effect of Al on the glass forming ability of Zr–Ni –Cu–Al alloys
- Fcc-hcp transformation-related internal friction in Fe –Mn alloys
- High-temperature stress and strain partitioning in duplex stainless steel
- Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
- Characterization of intermetallic compounds formed during the interfacial reactions of liquid Sn and Sn– 58Bi solders with Ni substrates
- Notifications/Mitteilungen
- Personal/Personelles
Articles in the same Issue
- Frontmatter
- Articles/Aufsätze
- Strain rate dependence of the deformation mechanisms in a fully lamellar γ-TiAl-based alloy
- Experimental and thermodynamic assessment of the Fe –Gd–Zr system
- Phase diagram of the Fe –Co –Ti system at 1073 K
- Copper concentration inside Guinier-Preston I zones formed in an Al –Cu alloy
- Identification of precipitates in 6013 aluminum alloy (Al –Mg –Si –Cu)
- Redistribution of phosphorus and carbon in steel weldments
- Microstructure and compressive properties of in situ synthesized TiC/Ti composites
- Effect of Al on the glass forming ability of Zr–Ni –Cu–Al alloys
- Fcc-hcp transformation-related internal friction in Fe –Mn alloys
- High-temperature stress and strain partitioning in duplex stainless steel
- Load sequence effects in the high cycle fatigue of two ferrite-pearlite microalloyed steels
- Characterization of intermetallic compounds formed during the interfacial reactions of liquid Sn and Sn– 58Bi solders with Ni substrates
- Notifications/Mitteilungen
- Personal/Personelles
