Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C

Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C

The Al-Nb-Sn phase diagram was studied experimentally in the Nb-rich region to provide important phase equilibria information for alloy design of Nb-silicide based materials for aero engine applications. Three alloys were produced: Nb-17Al-17Sn, Nb-33Al-13Sn and Nb-16Al-20Sn (at.%). As-cast and heat...

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Main Authors: Ioannis Papadimitriou, Claire Utton, Panos Tsakiropoulos
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Materials
Subjects:
engineering and physical sciences research council (EPSRC)-rolls royce (RR) strategic partnership
phase equilibria
niobium
aluminium
tin
Nb<sub>5</sub>Sn<sub>2</sub>Al
Online Access:https://www.mdpi.com/1996-1944/12/17/2759
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spelling doaj-09344cac08f641ad8fee6c8cc3b3871c2020-11-24T21:29:49ZengMDPI AGMaterials1996-19442019-08-011217275910.3390/ma12172759ma12172759Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °CIoannis Papadimitriou0Claire Utton1Panos Tsakiropoulos2Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, England, UKDepartment of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, England, UKDepartment of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, England, UKThe Al-Nb-Sn phase diagram was studied experimentally in the Nb-rich region to provide important phase equilibria information for alloy design of Nb-silicide based materials for aero engine applications. Three alloys were produced: Nb-17Al-17Sn, Nb-33Al-13Sn and Nb-16Al-20Sn (at.%). As-cast and heat-treated alloys (900 and 1200 &#176;C) were analysed using XRD (X-ray diffraction) and SEM/EDS (scanning electron microscopy/ electron dispersive x-ray spectroscopy). Tin showed a high solubility in Nb<sub>2</sub>Al, reaching up to 21 at.% in the Sn-rich areas, substituting for Al atoms. Tin and Al also substituted for each other in the A15 phases (Nb<sub>3</sub>Al and Nb<sub>3</sub>Sn). Tin showed limited solubility in NbAl<sub>3</sub>, not exceeding 3.6 at.% as it substituted Al atoms. The solubility of Al in NbSn<sub>2</sub> varied from 4.8 to 6.8 at.%. A ternary phase, Nb<sub>5</sub>Sn<sub>2</sub>Al with the tI32 W<sub>5</sub>Si<sub>3</sub> crystal structure, was found to be stable. This phase was observed in the 900 &#176;C heat-treated samples, but not in the 1200 &#176;C heated samples.https://www.mdpi.com/1996-1944/12/17/2759engineering and physical sciences research council (EPSRC)-rolls royce (RR) strategic partnershipphase equilibrianiobiumaluminiumtinNb<sub>5</sub>Sn<sub>2</sub>Al
collection DOAJ
language English
format Article
sources DOAJ
author Ioannis Papadimitriou
Claire Utton
Panos Tsakiropoulos
spellingShingle Ioannis Papadimitriou
Claire Utton
Panos Tsakiropoulos
Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
Materials
engineering and physical sciences research council (EPSRC)-rolls royce (RR) strategic partnership
phase equilibria
niobium
aluminium
tin
Nb<sub>5</sub>Sn<sub>2</sub>Al
author_facet Ioannis Papadimitriou
Claire Utton
Panos Tsakiropoulos
author_sort Ioannis Papadimitriou
title Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
title_short Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
title_full Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
title_fullStr Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
title_full_unstemmed Phase Equilibria in the Nb-Rich Region of Al-Nb-Sn at 900 and 1200 °C
title_sort phase equilibria in the nb-rich region of al-nb-sn at 900 and 1200 °c
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-08-01
description The Al-Nb-Sn phase diagram was studied experimentally in the Nb-rich region to provide important phase equilibria information for alloy design of Nb-silicide based materials for aero engine applications. Three alloys were produced: Nb-17Al-17Sn, Nb-33Al-13Sn and Nb-16Al-20Sn (at.%). As-cast and heat-treated alloys (900 and 1200 &#176;C) were analysed using XRD (X-ray diffraction) and SEM/EDS (scanning electron microscopy/ electron dispersive x-ray spectroscopy). Tin showed a high solubility in Nb<sub>2</sub>Al, reaching up to 21 at.% in the Sn-rich areas, substituting for Al atoms. Tin and Al also substituted for each other in the A15 phases (Nb<sub>3</sub>Al and Nb<sub>3</sub>Sn). Tin showed limited solubility in NbAl<sub>3</sub>, not exceeding 3.6 at.% as it substituted Al atoms. The solubility of Al in NbSn<sub>2</sub> varied from 4.8 to 6.8 at.%. A ternary phase, Nb<sub>5</sub>Sn<sub>2</sub>Al with the tI32 W<sub>5</sub>Si<sub>3</sub> crystal structure, was found to be stable. This phase was observed in the 900 &#176;C heat-treated samples, but not in the 1200 &#176;C heated samples.
topic engineering and physical sciences research council (EPSRC)-rolls royce (RR) strategic partnership
phase equilibria
niobium
aluminium
tin
Nb<sub>5</sub>Sn<sub>2</sub>Al
url https://www.mdpi.com/1996-1944/12/17/2759
work_keys_str_mv AT ioannispapadimitriou phaseequilibriainthenbrichregionofalnbsnat900and1200c
AT claireutton phaseequilibriainthenbrichregionofalnbsnat900and1200c
AT panostsakiropoulos phaseequilibriainthenbrichregionofalnbsnat900and1200c
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