|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Dislocation Dynamics in a BCC Refractory Multi-Principal Element Alloy MoNbTi
||Fulin Wang, Glenn Balbus, Jungho Shin, Paul Rottmann, Jean-Charles Stinville, Leah Mills, Oleg Senkov, Tresa Pollock, Daniel Gianola
|On-Site Speaker (Planned)
Refractory multi-principal element (MPE) alloys have emerged as a promising class of materials for their potential in high temperature applications. However, knowledge of the fundamental deformation mechanisms in the concentrated compositional environment and in the BCC crystal structure is still nascent, particularly on the experimental front. In this work, the dislocation behavior of a model alloy MoNbTi is studied by performing in situ tension experiments utilizing transmission mode in a scanning electron microscope (TSEM). Both collective slip activities and individual dislocation line morphologies are revealed. Quantitative crystallographic analyses allow the determination of the slip planes and the line directions of the gliding dislocations, and determination of the adherence to Schmid behavior. In contrast to common elemental BCC metals, the MPE alloy shows profuse slip activity on high order planes. The dislocations have mixed character, suggesting comparable critical resolved shear stress and mobility of the edge and screw components.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume