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Special Issue: Plasticity of Crystals and Interfaces; Journal: Crystals

mesarovic's picture

Journal: Crystals

Special Issue: Plasticity of Crystals and Interfaces

Special Issue Editor: Sinisa Dj. Mesarovic

Deadline for submission of papers: 30 April 2017

 

Summary

Dear Colleagues,

 

Eight decades ago, brilliant insights of Orowan, Polanyi and Taylor brought about understanding of the basic plasticity mechanisms in crystals and ushered a new era of exploration of basic mechanical properties of polycrystalline materials.  Much has been learned and many phenomena are either understood qualitatively or incorporated into predictive models.  Nevertheless, some important questions still elude our efforts to fully comprehend plasticity of polycrystals and crystalline composites.   The list of keywords given below provides brief summary of the open issues.  The list is illustrative and the contributions are not limited to these topics.

 

The interactions of crystal dislocations with interfaces and with the interface dislocation structure have been investigated at length in past few decades, but the sheer complexity of the problem has thus far prevented a systematic description.  Moreover, these interactions are the key component of the observed size effects in plasticity.  The problem is compounded by the variety of mechanisms for interface mobility at low and high temperatures.  In a single crystal, the kinematics of glide at low temperatures is well understood, but the dislocation climb and its interaction with vacancy diffusion still lacks the full mathematical description.

 

The special issue on Plasticity of Crystals and Interfaces is intended as a forum to present the current state-of-the-art and recent advances, as well as to suggest the future directions.  Experimental, computational and theoretical contributions are invited.  Of particular interest are the contributions which provide understanding of micro-scale mechanisms and/or enable their description within meso-scale models.

 

 Sinisa Dj. Mesarovic

 

Keywords:

·         Interface plasticity

·         Dislocation climb and diffusion

·         Grain boundary sliding and migration

·         Size-effects in plasticity

 

·         Dislocation nucleation

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Comments

Mohammad Aramfard's picture

Dear Professor Mesarovic,

 

Thanks for talking about this taopic, I just want to make some comment about grain boundary motion and behavior.

grain boundary has been studied more after the introduction of nanocrystalline metals that have high grain boundary volume fraction. The interesting behaviors of grain boundaries including migration under stress or thermal energy have been studied very well these years. I just mention some famous works in this field:

 

Coupling grain boundary motion to shear deformation, John W. Cahn, Yuri Mishin, Akira Suzuki, Acta Materialia, 2006.

http://www.sciencedirect.com/science/article/pii/S1359645406005313

 

Experimental observations of stress-driven grain boundary migration, T.J. Rupert, D.S. Gianola, Y. Gan, K.J. Hemker, Science, 2009.

http://science.sciencemag.org/content/326/5960/1686

 

and other works. Recently a few of interesting works addressed grain boundary description specifically phase transformation based on thermodynamics,

Thermodynamics of coherent interfaces under mechanical stresses I and II, T. Frolov, Y. Mishin, PRB, 2012.

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.85.224106

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.85.224107

structural phase transformations in metallic grain boundaries, T. Frolov, D.L. Olmsted, M. Asta, Y. Mishin, Nature Communications, 2013.

http://www.nature.com/articles/ncomms2919

 

Now I think it is the right time to address the grain boundary migration based on thermodynamic description. Since thermodynamics has the power to relate microscopic phenomena such as grain boundary migration to macroscopic properties such as temperature, pressure and volume and helps us to have a macroscopic interpretation of plasticity in interfaces.

 

mesarovic's picture

Thanks for the comment.  

Indeed, grain boundaries represent a significant problem that needs to be addressed systematically.  In other words, the problem requires analysisi on both micro- (atomistic) and meso-scale (continuum?).  Interactions with diffusion, dislocation motion and boundary migration mechanisms are the key problems.

Regards.

Sinisa

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