Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

Stein, Frank; Philips, Noah

doi:10.1007/s11661-017-4334-0

Metall Mater Trans A

2017

DOI: 10.1007/s11661-017-4334-0

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Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

Frank Stein

Noah Philips²

Abstract: High-melting Nb-based alloys hold significant promise for the development of novel high-temperature materials for structural applications. In order to understand the effect of alloying elements Al and Fe, the Nb-rich part of the ternary Nb-Al-Fe system was investigated. A series of Nb-rich ternary alloys were synthesized from high-purity Nb, Al, and Fe metals by arc melting. Solidification paths were identified and the liquidus surface of the Nb corner of the ternary system was established by analysis of the a… Show more

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“…Stein et al [6] investigated the Nb-rich corner of the Nb-Al-Fe ternary phase equilibria as a part of the effort to develop structural Nb-based alloys for very high temperature applications that possess multi-phase microstructure consisting of a Nb solid-solution phase and high-melting, strengthening intermetallic phase(s). Effect of Fe on the stability and the solubility limits in the Nb solid-solution phase, Nb 2 Al, and Nb 3 Al intermetallic phases was examined.…”

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Suzuki

Heilmaier

Sallot

et al. 2018

Metall Mater Trans A

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Nickel-based superalloys possess an excellent combination of mechanical properties and environmental resistance at elevated temperatures, and have been widely used in challenging environments prevalent in aircraft engines and land-based power generation gas turbines, as well as in nuclear power systems and chemical plants. The ever-increasing demand for higher operating temperatures to achieve better fuel efficiency has been driving the development of the next generation of superalloys, in which the higher temperature capability has been achieved by increasing additions of refractory elements, optimizing processing conditions, and through the application of coatings. However, there is a strong need for materials that can make a disruptive change in temperature capability beyond that provided by current materials.The symposium ''Materials for High Temperature Applications: Next Generation Superalloys and Beyond'' was held during the 2017 TMS annual Meeting from February 27 to March 2, 2017 in San Diego, California, with the sponsorship from the TMS High Temperature Alloys Committee and TMS Refractory Metals Committee. The goal of this symposium was to discuss (i) challenges that current Ni-based superalloys are facing and (ii) the recent progress in the development of next generation of superalloys and high temperature material systems beyond Ni-based superalloys. The symposium was composed of a total of seven sessions covering current and next generation Ni-based superalloys, refractory metal-based materials, intermetallic-based materials, coatings, Ir-based alloys, and ceramics composites and emerging materials. The organizers would like to thank all the presenters and the participants for their excellent contribution to the success of this symposium. There were in total 60 oral presentations, including 2 keynote presentations and 18 invited presentations, and 6 poster presentations. This special issue presents selections of 10 high quality research papers submitted to this symposium. We would like to express our appreciation to Prof.

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confidence: 99%

Foreword

Suzuki

Heilmaier

Sallot

et al. 2018

Metall Mater Trans A

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Experimental Liquidus Surface Projection and Thermodynamic Modeling of the Fe-Mo-Nb System

Zou

Guo

et al. 2019

Metall Mater Trans A

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About the Alkemade Theorem and the Limits of its Applicability for the Construction of Ternary Liquidus Surfaces

Stein,

2024

J. Phase Equilib. Diffus.

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The Alkemade theorem goes back to a very fundamental paper on the graphical description of thermodynamic equilibrium problems from 1893 (van Rijn van Alkemade in Z Phys Chem 11: 289-327, 1893). It is one of the most helpful implements for the construction of the liquidus surface of ternary phase diagrams. In its original form, it allows to find the direction of falling or increasing temperature along the monovariant reaction lines forming the boundaries of the primary crystallization fields. The theorem is valid for systems with any number of phases; however, its geometrical construction rule is only defined for the case of stoichiometric phases and it is not clear how to apply the theorem in the case of phases with extended homogeneity ranges. Some examples from a ternary, transition-metal-based system containing phases with large homogeneity ranges are presented, and the usefulness and limits of applicability of the theorem are discussed.

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Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

Cited by 4 publications

References 19 publications

Foreword

Foreword

Experimental Liquidus Surface Projection and Thermodynamic Modeling of the Fe-Mo-Nb System

About the Alkemade Theorem and the Limits of its Applicability for the Construction of Ternary Liquidus Surfaces

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