Changes in lattice structure and microhardness during thermal treatment of a NiCoCrAIY alloy
- The stability of microstructure and the microhardness of a NiCoCrAlY alloy was studied after thermal treatment at high temperatures and subsequent quenching into ice water. The alloy revealed mainly two ordered phases, a gamma' phase with L12 lattice structure and a beta phase with B2 structure. The gamma' phase is shown to become unstable in the temperature range between 1073 K and 1373 K where it undergoes an order-disorder phase transformation. The low transformation temperature compared to pure Ni3Al is ascribed to deviations from the Ni3Al stoichiometry and to the additional alloying elements Co and Cr. The gamma'-gamma order-disorder transformation is shown to be attended by a decrease in microhardness of about 30 %.
Autor*innen: | Gerhard Schumacher, Hellmuth Klingelhöffer, T. Rehfeldt |
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Dokumenttyp: | Beitrag zu einem Sammelband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Thermal barrier coatings - 2000 |
Jahr der Erstveröffentlichung: | 2000 |
Verlag: | Materials Research Society |
Verlagsort: | Warrendale, Pa. |
Ausgabe/Heft: | 645 |
Veranstaltung: | Symposium M: Thermal Barrier Coatings; MRS (Materials Research Society) fall meeting |
Veranstaltungsort: | Boston, MA, USA |
Beginndatum der Veranstaltung: | 2000-01-01 |
ISSN: | 0272-9172 |
Bemerkung: | Serientitel: Materials Research Society symposium proceedings – Series title: Materials Research Society symposium proceedings |
Verfügbarkeit des Dokuments: | Weder Datei noch physisches Exemplar vorhanden ("No Access") |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Nein |