Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase

D. D. Risanti; G. Sauthoff

doi:10.1016/j.intermet.2011.07.008

Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase

D. D. Risanti^*, G. Sauthoff

^*Corresponding author for this work

Max Planck Institute for Iron Research

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

44 Citations (Scopus)

Abstract

The addition of Ta to Fe-Al alloys results in the formation of a stable Ta(Fe,Al)2 Laves phase with hexagonal C14 structure in the Fe-Al phase at temperatures of 800, 1000 and 1150 °C. It was found that the solubility of Ta in Fe-Al is generally low and the solubility of Ta varies with Al content. Respective isothermal sections of the Fe-Al-Ta system have been established. Particular attention has been given to precipitation in the Fe₃Al phase with a small addition of Ta. At intermediate temperatures, 600-750 °C, an additional Heusler-type phase with L2₁-structure precipitates, which transforms at longer times and high temperatures to the stable C14 Laves phase. The yield stress in compression and the creep behaviour of the Fe-Al-Ta alloys with various microstructures were studied. Due to the presence of the L2₁-Heusler phase, the yield stress and the creep resistance at temperatures below 700 °C was increased considerably.

Original language	English
Pages (from-to)	1727-1736
Number of pages	10
Journal	Intermetallics
Volume	19
Issue number	11
DOIs	https://doi.org/10.1016/j.intermet.2011.07.008
Publication status	Published - Nov 2011

Keywords

A. Iron aluminides (based on FeAl)
B. Creep (properties and mechanisms)
B. Mechanical properties at high temperatures
B. Phase diagram
B. Phase transformation

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10.1016/j.intermet.2011.07.008

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title = "Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase",

abstract = "The addition of Ta to Fe-Al alloys results in the formation of a stable Ta(Fe,Al)2 Laves phase with hexagonal C14 structure in the Fe-Al phase at temperatures of 800, 1000 and 1150 °C. It was found that the solubility of Ta in Fe-Al is generally low and the solubility of Ta varies with Al content. Respective isothermal sections of the Fe-Al-Ta system have been established. Particular attention has been given to precipitation in the Fe3Al phase with a small addition of Ta. At intermediate temperatures, 600-750 °C, an additional Heusler-type phase with L21-structure precipitates, which transforms at longer times and high temperatures to the stable C14 Laves phase. The yield stress in compression and the creep behaviour of the Fe-Al-Ta alloys with various microstructures were studied. Due to the presence of the L21-Heusler phase, the yield stress and the creep resistance at temperatures below 700 °C was increased considerably.",

keywords = "A. Iron aluminides (based on FeAl), B. Creep (properties and mechanisms), B. Mechanical properties at high temperatures, B. Phase diagram, B. Phase transformation",

author = "Risanti, {D. D.} and G. Sauthoff",

note = "Funding Information: The authors wish to thank Mr. R. Staegemann and Mr. M. Kulse for preparing the alloys, Mrs. H. B{\"o}gershausen for the metallographic work, Mr. W. Vogt and Mrs. I. Wossack for XRD analysis, Mr. U. Wellms for assistance in EPMA analysis, Mr. G. Bialkowski for sample preparation and mechanical testing, Mr. T. Schildheuer for DTA investigations and Drs. M. Palm, F. Stein and S. Kobayashi for the fruitful discussions on phase equilibria, DTA and EBSD analysis, respectively. The financial support by the Deutsche Forschungsgemeinschaft is gratefully acknowledged. ",

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N2 - The addition of Ta to Fe-Al alloys results in the formation of a stable Ta(Fe,Al)2 Laves phase with hexagonal C14 structure in the Fe-Al phase at temperatures of 800, 1000 and 1150 °C. It was found that the solubility of Ta in Fe-Al is generally low and the solubility of Ta varies with Al content. Respective isothermal sections of the Fe-Al-Ta system have been established. Particular attention has been given to precipitation in the Fe3Al phase with a small addition of Ta. At intermediate temperatures, 600-750 °C, an additional Heusler-type phase with L21-structure precipitates, which transforms at longer times and high temperatures to the stable C14 Laves phase. The yield stress in compression and the creep behaviour of the Fe-Al-Ta alloys with various microstructures were studied. Due to the presence of the L21-Heusler phase, the yield stress and the creep resistance at temperatures below 700 °C was increased considerably.

AB - The addition of Ta to Fe-Al alloys results in the formation of a stable Ta(Fe,Al)2 Laves phase with hexagonal C14 structure in the Fe-Al phase at temperatures of 800, 1000 and 1150 °C. It was found that the solubility of Ta in Fe-Al is generally low and the solubility of Ta varies with Al content. Respective isothermal sections of the Fe-Al-Ta system have been established. Particular attention has been given to precipitation in the Fe3Al phase with a small addition of Ta. At intermediate temperatures, 600-750 °C, an additional Heusler-type phase with L21-structure precipitates, which transforms at longer times and high temperatures to the stable C14 Laves phase. The yield stress in compression and the creep behaviour of the Fe-Al-Ta alloys with various microstructures were studied. Due to the presence of the L21-Heusler phase, the yield stress and the creep resistance at temperatures below 700 °C was increased considerably.

KW - A. Iron aluminides (based on FeAl)

KW - B. Creep (properties and mechanisms)

KW - B. Mechanical properties at high temperatures

KW - B. Phase diagram

KW - B. Phase transformation

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Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase

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Keywords

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