Creep degradation of the high entropy superalloy AlMo0.5NbTa0.5TiZr
- The refractory high entropy superalloy (RSA) AlMo0.5NbTa0.5TiZr was the first of a class, with a dual-phase microstructure that resembles that of γ/γ’ in Ni-base superalloys), and the open question whether it performs better as structural alloy under high temperature (HT) applications. Here, we address the HT creep behavior and its associated microstructural degradation of this RSA. The material was produced by arc-melting, heat treatment in argon (24 h @ 1400 °C + 4 h hot isostatic pressure @ 1370 °C & 170 MPa). Interrupted vacuum creep tests were performed at 900-1100 °C and 30-120 MPa. Scanning (S) and transmission (T) electron microscopy (EM) were used to reveal degradation mechanisms. At 1100 °C (Fig.1, middle), the dual A2/B2 microstructure coarsens and partially transforms into a Zr-Al-rich phase (red arrow). An additional external load pronounces directional coarsening. Results are further discussed on the base dislocation and additional damage mechanisms.
| Autor*innen: | Patricia Suárez Ocaño, Leonardo Agudo JácomeORCiD |
|---|---|
| Koautor*innen: | Christian Gadelmeier, Uwe Glatzel |
| Dokumenttyp: | Vortrag |
| Veröffentlichungsform: | Präsentation |
| Sprache: | Englisch |
| Jahr der Erstveröffentlichung: | 2022 |
| Organisationseinheit der BAM: | 5 Werkstofftechnik |
| 5 Werkstofftechnik / 5.1 Mikrostruktur Design und Degradation | |
| DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
| Freie Schlagwörter: | Dislocation creep; High entropy superalloy; Phase transformation; Rrafting |
| Themenfelder/Aktivitätsfelder der BAM: | Material |
| Material / Degradationsmechanismen | |
| Veranstaltung: | International Conferende on Strength of Materials (ICSMA) 2022 |
| Veranstaltungsort: | Metz, France |
| Beginndatum der Veranstaltung: | 26.06.2022 |
| Enddatum der Veranstaltung: | 01.07.2022 |
| Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
| Datum der Freischaltung: | 06.08.2025 |
| Referierte Publikation: | Nein |
| Eingeladener Vortrag (wissenschaftliche Konferenzen): | Nein |

