|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-133: Theoretical and Experimental Investigation of Phase Structure and Mechanical Property Dependence on Composition in Nb-Ti-V-Zr Multi-principal Element Alloys
||Mu Li, Zhaohan Zhang, Arashdeep Thind, Rohan Mishra, Katharine Flores
|On-Site Speaker (Planned)
Factors that affect the stability of single phase solid solutions in multi-principal element alloys (MPEAs) are unclear despite several empirical predictive models. In this work, the variation in phase structure with composition in NbTixVZr was investigated using a high-throughput, laser deposition-based synthesis method. The stability of the observed phases was further investigated using density functional theory (DFT) calculations. We find that the stability of a single phase solid solution does not correlate with compositional complexity. Multiple phases were observed in equimolar NbVZr, including BCC solid solution, C14 (hexagonal) and C15 (cubic) Laves phases; the C14 was previously reported to be unstable. The addition of Ti results in the stabilization of single BCC solid solution. We also observe stacking faults in the Laves phases and calculate their stacking fault energies with DFT. Ongoing nanoindentation and micropillar compression measurements will provide an improved understanding of the structure-property correlation in this MPEA system.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume