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MATCHING LOCAL COMPOSITION AND MECHANICAL PROPERTY ANISOTROPY OF PREOXIZED (Ni, Pt)Al BOND COATS AFTER THERMAL CYCLING TESTS

García-Herrera, J.E. und Mora-García, A.M. und Alvarado-Orozco, J.M. und Cácerez-Díaz, L.A. und Konitzer, D.G. und Mondragón Rodríguez, G.C. und Schulz, Uwe und Trápaga-Martínerz, G. und Muñoz-Saldaña, J. (2013) MATCHING LOCAL COMPOSITION AND MECHANICAL PROPERTY ANISOTROPY OF PREOXIZED (Ni, Pt)Al BOND COATS AFTER THERMAL CYCLING TESTS. XXII International Materials Research Congress, 2013-08-11 - 2013-08-15, Cancún Mexiko.

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Kurzfassung

Pt-modified nickel aluminide, B2 (Ni,Pt)Al, coatings are used to protect the surface of turbine airfoils against oxidation [1]. However, the lack of ductility of these systems presents a drawback in their performance. At high temperatures several elements diffuse from the superalloy substrate and become incorporated into the B2 phase, which can modify its mechanical properties. This diffusion process also results in a distribution of elements throughout the coating that can change from grain to grain. Few reports on the local, micromechanical properties of B2 (Ni,Pt)Al coatings measured by nanoindentation, taking into account crystal orientation, have been published. No anisotropy effect of elastic modulus in the B2 (Ni,Pt)Al was observed by Durst et al. [2], but their finding remains to be understood, and the effect of local chemical composition is yet to be thoroughly explored. In this work, coupons of Rene-N5 superalloy coated with a B2 (Ni,Pt)Al bond coat were pre-oxidized at different temperatures and oxygen partial pressures (pO2) in order to generate a protective α-Al2O3 scale. An yttria-stabilized zirconia (7YSZ) top-coat layer was subsequently deposited by EB-PVD to complete the thermal barrier coating (TBCs). Finally, the TBCs were subjected to thermal cycling tests, during which the (Ni,Pt)Al was observed to transform from pure B2 to a combination of L10 (martensitic), L12 (ordered fcc), and B2 (ordered bcc) phases. Electron backscattering diffraction (EBSD) was used to identify the crystal orientation of the different phases. The mechanical properties of grains oriented in the [001], [101], and [111] directions were measured by nanoindentation with two different indenter geometries, Berkovich and cono-spherical. No anisotropy of mechanical properties was found using the Berkovich indenter, whereas slight differences were observed with the cono-spherical indenter. Moreover, strong differences in the elastic limit were observed when measuring with the cono-spherical within the same grain, which is attributed to differences in the local chemical composition. Finally, the mechanical properties of the L10 and L12 phases are presented and discussed. References: [1] J. Esslinger and E.E. Affeldt, Transactions of the ASME, Journal of Engineering for Gas Turbines and Power, 121 (1998): 687-690. [2] K. Durst, O. Franke and M. Göken, Proceedings Superalloys (2004): 467-476.

elib-URL des Eintrags:https://elib.dlr.de/84684/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:MATCHING LOCAL COMPOSITION AND MECHANICAL PROPERTY ANISOTROPY OF PREOXIZED (Ni, Pt)Al BOND COATS AFTER THERMAL CYCLING TESTS
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
García-Herrera, J.E.Cinvestav, Unidad Querétaro MéxicoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mora-García, A.M.Cinvestav, Unidad Querétaro MéxicoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Alvarado-Orozco, J.M.University of PittsburghNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Cácerez-Díaz, L.A.Cinvestav, Unidad Querétaro MéxicoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Konitzer, D.G.General Electric CincinnatiNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mondragón Rodríguez, G.C.guillermo.mondragon-rodriguez (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103NICHT SPEZIFIZIERT
Trápaga-Martínerz, G.Cinvestav, Unidad Querétaro, MéxicoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Muñoz-Saldaña, J.Cinvestav, Unidad Querétaro, MéxicoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:13 August 2013
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Thermal barrier coatings, mechanical properties, nanoindentation, phase transformations
Veranstaltungstitel:XXII International Materials Research Congress
Veranstaltungsort:Cancún Mexiko
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:11 August 2013
Veranstaltungsende:15 August 2013
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Turbinentechnologien (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Hochtemperatur-und Funktionsschutzschichten
Hinterlegt von: Mondragon Rodriguez, Guillermo Cesar
Hinterlegt am:16 Okt 2013 09:52
Letzte Änderung:24 Apr 2024 19:50

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