About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond III
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Presentation Title |
Do We Need a Refractory Alloy with Super-high Strength at Room Temperature? |
Author(s) |
Daniel B. Miracle, S. Rao, Oleg N. Senkov, Carolina Frey |
On-Site Speaker (Planned) |
Daniel B. Miracle |
Abstract Scope |
Refractory complex concentrated alloys (RCCAs) are potential candidates for high-temperature (HT) structural applications beyond Ni-based superalloys. The number of publications on RCCAs is growing rapidly and many new RCCAs have been developed and reported. Although RCCAs are primarily targeted as for HT applications, many publications only report room temperature (RT) properties, and it is tempting to assume that alloys with very high RT strength may better retain strength at elevated temperatures. The purpose of this study is to explore this hypothesis. Our analysis shows no direct correlation between RT and HT strengths. Many RCCAs with RT strengths >1200 MPa lose strength rapidly above ~ 800-1000°C, and many of these alloys also have poor RT ductility. RCCAs that are ductile at RT and strong at HT generally have RT yield strengths ≤1200 MPa with a relatively weak temperature dependence. It is concluded from this analysis that RCCAs intended for HT structural applications do not need to have super-high strength at RT. Details of this analysis will be provided in the presentation. |