About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond II
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Presentation Title |
A High-throughput Strategy to Study Phase Stability and Mechanical Properties in Complex Concentrated Alloys |
Author(s) |
Mu Li, Zhaohan Zhang, Arashdeep Thind, Guodong Ren, Rohan Mishra, Katharine M. Flores |
On-Site Speaker (Planned) |
Katharine M. Flores |
Abstract Scope |
Although the design of high entropy alloys often focuses on identifying equiatomic solid solution alloys, expanding these complex concentrated alloys (CCAs) to include multiphase microstructures offers the opportunity to further enhance properties. However, information about the stability of competing intermetallic phases is still lacking. Here, we examine phase stability in Nb-Ti-V-Zr as a function of composition. Starting with an equiatomic NbVZr alloy, we observe two Laves phases, cubic C15 and hexagonal C14, in addition to the BCC majority phase. First-principles calculations predict the stable composition for each phase, which are consistent with experimental observations. We then rapidly synthesize Nb-Ti-V-Zr compositional libraries via laser deposition, and use these to map the crystal structures, microstructures and mechanical properties as a function of composition. Experimental results are compared with first-principles calculations. This work provides guidelines for predicting compositional effects on microstructure and properties, which will accelerate the design of CCAs for high-temperature applications. |