Das, Saurabh Mohan ; Singh, Mahander Pratap ; Chattopadhyay, Kamanio (2019) Evolution of oxides and their microstructures at 800°C in a γ-γ’ stabilised Co-Ni-Al-Mo-Ta superalloy Corrosion Science, 155 . pp. 46-54. ISSN 0010938X
Full text not available from this repository.
Official URL: http://doi.org/10.1016/j.corsci.2019.02.013
Related URL: http://dx.doi.org/10.1016/j.corsci.2019.02.013
Abstract
The paper reports mechanism of high temperature oxidation of the new γ’-strengthened Co-30Ni-10Al-5Mo-2Ta (at%) alloy. The plots of mass gain vs. time show a parabolic growth behaviour at a temperature range of 650–800 °C. The cross-sections of the oxidised samples reveal formation of a complex multilayer of oxides. The top layer comprises of Co3O4 followed by a solid solution of (Co1-x,Nix)O (x varying from 0-0.2). A middle layer evolves with time comprising hexagonal molybdate Co2Mo3O8, metastable TaO and amorphous Al2O3. The γ’ dissolve near the interface exposing the γ solid solution with growth of amorphous Al2O3 along the grain boundary.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Ltd |
| Keywords: | γ-γ’ Cobalt based superalloys;Oxidation;Multi oxide layers;STEM |
| ID Code: | 135180 |
| Deposited On: | 20 Jan 2023 04:50 |
| Last Modified: | 20 Jan 2023 04:50 |
Repository Staff Only: item control page
