| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Computation Assisted Materials Development for Improved Corrosion Resistance
|
| Presentation Title |
Assessment of the Role of Minor Refractory Alloying Additions in Affecting Alumina-Scale Formation During High-Temperature Oxidation of Ni-based model alloys |
| Author(s) |
Rafael T. Rodriguez De Vecchis, Rishi Pillai, Kim Kisslinger, Meng Li, Judith Yang, Brian Gleeson |
| On-Site Speaker (Planned) |
Rafael T. Rodriguez De Vecchis |
| Abstract Scope |
During the last decades, new generations of Ni-based superalloys have emerged with judiciously controlled chemistries. These alloys heavily rely on the addition of refractory elements to enhance their mechanical properties at elevated temperatures, however, a clear interpretation of the influence of these minor-element additions on the alloy’s high-temperature oxidation is still not well understood, particularly from the standpoint of predicting the transition from internal to external alumina formation. In this context, the present investigation describes a systematic study that addresses the intrinsic effect that minor element additions of Nb, Ta, and Re have on the oxidation behavior of alumina-scale forming γ-Ni alloys. By combining a novel simulation approach with high-temperature oxidation experiments and advanced characterization techniques, the present study evidences the positive effect associated with 2 at. % addition of Ta and Re as well as the detrimental consequences of Nb additions on the 1100 °C oxidation of Ni-6Al-(0,4,6,8)Cr alloys. |