63856 2022 eng lecture 0 -- -- -- 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. International Conferende on Strength of Materials (ICSMA) 2022 Metz, France 26.06.2022 01.07.2022 0 publish false true Patricia Suárez Ocaño Leonardo Agudo Jácome eng uncontrolled High entropy superalloy eng uncontrolled Rrafting eng uncontrolled Dislocation creep eng uncontrolled Phase transformation Ingenieurwissenschaften und zugeordnete Tätigkeiten 5 Werkstofftechnik 5.1 Mikrostruktur Design und Degradation Material Degradationsmechanismen Datei im Netzwerk der BAM verfügbar ("Closed Access") Präsentation