|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P37: Dislocation Multiplication from a Frank-Read Source in Body-centered Cubic Pure Metals and Multi-principal Element Alloys
||Shuozhi Xu, Lauren Smith, Yanqing Su, Irene J. Beyerlein
|On-Site Speaker (Planned)
Understanding plastic deformation in metallic materials necessitates modeling of dislocation multiplication. A well-known intragranular dislocation source, the Frank-Read (FR) source, plays an important role in size-dependent plasticity in metals. Despite numerous studies in this topic for pure metals, an investigation of multiple aspects of the FR source in multi-principal element alloys (MPEAs) is lacking. In this work, we simulate dislocation multiplication from an FR source in two pure metals (Mo and Nb) and one multi-principal element alloys (MoNbTi) with body-centered cubic structure, via a phase-field dislocation dynamics method. Focus is on critical shear stress for the FR source activation. Our results shed light on developing more accurate continuum models for FR source activation.