About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond II
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Presentation Title |
The Role of Composition and Static Displacements on Phase Stability of BCC High Entropy Alloys |
Author(s) |
German Samolyuk, Yuri Osetsky, Malcolm Stocks, James R. Morris |
On-Site Speaker (Planned) |
James R. Morris |
Abstract Scope |
A primary focus on high entropy alloy research has been identifying compositions that form solid solutions. For BCC solid solutions, there is significant attention to the role of transformation-induced plasticity, as a mechanism that may promote ductility. We discuss how composition and local distortions affect phase stability. We demonstrate that in BCC structures, the static displacements are both large and strongly composition dependent. In cases such as HfNbTiZr, we show that large displacements are crucial for understanding the observed stability of the BCC phase at low temperatures, implying a non-entropic contribution to the phase stability. We discuss the origin of this, and the connection to transformation pathways in these materials.
Work supported by Department of Energy’s Office of Science, Basic Energy Science, through the Energy Dissipation to Defect Evolution EFRC (GDS, YO and GMS), and through the Materials Science and Engineering Division (JRM). |