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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Computational Discovery and Design of Materials
Presentation Title Homogeneous Solute Segregation Suppressing Strain Localization in Nanocrystalline Ni-Nb Alloys
Author(s) Roshan Kumar Jha, Sumantra Mandal
On-Site Speaker (Planned) Roshan Kumar Jha
Abstract Scope Solute segregation to individual grain boundaries is a valuable technique for enhancing the strength and stability of nanocrystalline materials. This study utilizes Hybrid Monte Carlo and molecular dynamics simulations to investigate the impact of solute segregation in nanotwinned nickel grain boundaries. Precise calculations of segregation energy at each grain boundary site reveal the spectral characteristics of the grain boundary atoms. Additionally, the study also investigates the influence of solute concentration on the mechanical deformation behavior of nanotwinned Ni-Nb alloy. The results demonstrate a significant reduction in strain localization during plastic deformation, attributed to the segregation of niobium solute atoms to the grain boundaries. Moreover, the tensile yield strength shows a linear increase up to a solute concentration of 5 at. %, followed by a decline at higher concentrations. This decline is primarily attributed to the influence of niobium doping on the available grain boundary-free volume.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Computational Materials Science & Engineering, Copper / Nickel / Cobalt

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