About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
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Presentation Title |
Sluggish Diffusion in Concentrated Solid-solution Alloys: Seeing is Believing |
Author(s) |
Yanwen Zhang |
On-Site Speaker (Planned) |
Yanwen Zhang |
Abstract Scope |
Controlling atomic motion to suppress defect evolution is a challenge in materials science. Sluggish diffusion is defined as reduced defect mobility or as decreased migration length of point defects or defect clusters. MD simulations have revealed enhanced sluggish diffusion in chemically disordered concentrated solid-solution alloys (CSAs) where the motion of interstitial defect clusters can be tailored from a long-range 1D motion in pure Ni to a short-range 3D mode in NiFe. Experimental observations have shown slow loop growth, delayed He bubble superlattice formation, and enhanced swelling resistance in complex CSAs. There is, however, a missing link between the atomistic simulations and observable defect features. Seeing is believing: work done by I. M. Robertson’s group provides direct observations of decreased dislocation loop glide distances and jump frequencies (i.e., enhanced sluggish diffusion) in Ni, CSAs and high-entropy alloys with increasing chemical complexity, bridges the knowledge gap and addresses the challenges. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Entropy Alloys, Nuclear Materials |