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Published on: December 29, 2016
Dynamic plastic deformation delocalization in FCC solid solution metals
Dhruv Anjaria1, Milan Heczko2, Daegun You3
1Materials Science & Engineering Department, University of Illinois Urbana-Champaign, Urbana, IL, USA. anjaria3@illinois.edu.
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Metallic materials undergo irreversible deformation under mechanical loading, leading to intense local plastic localization that reduces their mechanical performance. We identify a mechanism of plastic deformation that dynamically promotes the homogenization of plasticity in face-centered cubic solid solution-strengthened metallic alloys. We observe that this mechanism occurs within a narrow range of stacking fault energies and involves competing deformation between nanoscale twinning and slip. This phenomenon is attributed to a new mechanism referred to as dynamic plastic deformation delocalization, which opens a new design space for enhancing the mechanical performance of metallic materials. We demonstrate that the activation of this mechanism has a significant impact on fatigue properties, greatly enhancing fatigue strength when it occurs.
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