Authors:

Claire Russell

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About Paper:

Refractory Complex Concentrated Alloys (RCCAs) are high temperature-capable metal alloys that typically do not contain one majority element and contain four or more metal elements in high concentrations. These alloys may serve as a potential replacement of state-of-the-art Ni-based superalloys and conventional refractory alloys due to their enhanced mechanical properties at high temperatures. However, many refractory alloys do not exhibit satisfactory high temperature oxidation and environmental resistance, and literature studies suggests that oxidation resistance can be improved via the formation of an external Al2O3, Cr2O3, or SiO2 layer in the oxidizing environments. For this study, we selected RCCAs from (1) existing literature and (2) new compositions predicted from machine learning models that exhibit superior oxidation resistance and fabricated them using the arc melting process. We performed oxidation testing at approximately 1000 ºC (recoding mass changes) and identified surface oxide phases using Raman spectroscopy. The results from Raman spectroscopy will be compared to direct electron microscopy observations from the literature. Finally, we show that this technique can be used as a fast, and high-throughput experimental method to identify oxides phases and the results will be used in future machine learning models to predict oxidation-resistant high temperature RCCAs.

Source:

Purdue University / 2023

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Co-authors:

Claire Russell