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Mechanics and Physics of Defects in Crystals: A Collection in Honor of Professor Nasr Ghoniem

Most mechanical properties of crystalline materials are determined by the characteristics of their lattice defects, their dynamics and their mutual collective interactions. Distinguished Professor Nasr Ghoniem dedicated his career to the field of the mechanics and physics of defects in crystals, with his major contributions focused upon the development of multiscale computational methods for plasticity. The utmost highlight of his illustrious career has been the introduction and development of the discrete dislocation dynamics method. On the occasion of Professor Nasr Ghoniem’s retirement and the associated symposium at the MMM2022 Conference, this collections aims to honor his career contributions and foster the advancements in the mechanics and physics of crystal defects, by bringing together contributions from the international community of modelers and experimentalists in this field, including original research, reviews and commentaries on modern lasting impacts of Professor Ghoniem's career work. 

Topics of interest include, but are not limited to:

  • Discrete dislocation dynamics and molecular dynamics simulations of plasticity and related phenomena
  • Continuum plasticity, phase field and other mesoscale simulation methods
  • Ab-initio investigations of defect energetics and their mechanical property connections
  • Interactions and mechanisms among point defects, dislocations, grain boundaries and material interfaces
  • Novel computational methods in the mechanics and multiscale modeling of crystal defects
  • Mechanics and physics of defects in high-temperature and/or irradiated materials 
  • Statistical aspects of defect microstructure evolution, self-organization and pattern formation
  • Novel experimental investigations of defects in crystalline materials
  • Novel experimental techniques for resolving fine dislocation structural details

Guest Editors

Stefanos Papanikolaou, National Centre for Nuclear Research, Poland

Giacomo Po, University of Miami, USA

Ryan Sills, Rutgers University, USA

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  1. Precipitation hardening, a cornerstone of alloy strengthening, finds widespread application in engineering materials. Comprehending the underlying mechanisms and formulating models bear crucial significance fo...

    Authors: Aiya Cui, Xiaoming Wang and Yinan Cui
    Citation: Journal of Materials Science: Materials Theory 2024 8:13
  2. The mechanical behavior of most metals in engineering applications is dominated by the grain size. Physics-based models of the interaction between dislocations and the grain boundary are important to correctly...

    Authors: M. Stricker and D. Weygand
    Citation: Journal of Materials Science: Materials Theory 2024 8:12
  3. Stress-driven segregation at dislocations can lead to structural transitions between different linear complexion states. In this work, we examine how platelet array linear complexions affect dislocation motion...

    Authors: Pulkit Garg, Daniel S. Gianola and Timothy J. Rupert
    Citation: Journal of Materials Science: Materials Theory 2024 8:9
  4. Under plastic flow, multi-element high/medium-entropy alloys (HEAs/MEAs) commonly exhibit complex intermittent and collective dislocation dynamics owing to inherent lattice distortion and atomic-level chemical...

    Authors: Kamran Karimi, Amin Esfandiarpour and Stefanos Papanikolaou
    Citation: Journal of Materials Science: Materials Theory 2024 8:7
  5. A non-singular dislocation theory of straight dislocations in anisotropic crystals is derived using simplified anisotropic incompatible first strain gradient elasticity theory. Based on the non-singular theory...

    Authors: Markus Lazar and Giacomo Po
    Citation: Journal of Materials Science: Materials Theory 2024 8:5
  6. The deformation behavior of Ti-6Al-4V titanium alloy is significantly influenced by slip localized within crystallographic slip bands. Experimental observations reveal that intense slip bands in Ti-6Al-4V form...

    Authors: Behnam Ahmadikia, Adolph L. Beyerlein, Jonathan M. Hestroffer, M. Arul Kumar and Irene J. Beyerlein
    Citation: Journal of Materials Science: Materials Theory 2024 8:4
  7. Unraveling the effects of continuous dislocation interactions with interfaces, particularly at the nanometer length scales, is key to a broader understanding of plasticity, to material design and to material c...

    Authors: Aritra Chakraborty, Aaron A. Kohnert, Abigail Hunter and Laurent Capolungo
    Citation: Journal of Materials Science: Materials Theory 2024 8:3