Improved constitutive description of single crystal viscoplastic deformation by dislocation climb

Ricardo A. Lebensohn; R.A. Holt; A. Caro; A. Alankar; C.N. Tomé

doi:10.1016/j.crme.2012.02.011

Improved constitutive description of single crystal viscoplastic deformation by dislocation climb

Ricardo A. Lebensohn ¹ ; R.A. Holt ² ; A. Caro ¹ ; A. Alankar ¹ ; C.N. Tomé ¹

¹ Materials Science and Technology Division, Los Alamos National Laboratory, MS G755, Los Alamos, NM 87545, USA
² Department of Mechanical and Materials Engineering, Queenʼs University at Kingston, K7L 3N6, Canada

Comptes Rendus. Mécanique, Volume 340 (2012) no. 4-5, pp. 289-295.

Résumé

This article presents a continuum-level constitutive model of a single crystal deforming by dislocation climb, accounting for crystallography and dislocation/point-defect interactions. The proposed constitutive description represents an improvement over a previous recent model, which extended the rate-sensitivity approach for single crystal plasticity by dislocation glide to consider the deformation geometry of dislocation climb under the assumption of instantaneous restoration of equilibrium concentration of vacancies near climbing dislocations. The key element of the new model is a chemical stress parameter, which represents the additional driving force on climbing dislocations due the excess vacancy concentration. The original and new versions of the crystallographic model of climb are compared through a simple example of a strongly anisotropic single crystal that illustrates the differences in response due to the consideration or not of the chemical driving force for climb.

Publié le : 2012-03-28

DOI : 10.1016/j.crme.2012.02.011

Mots clés : Single crystal, Crystal plasticity, Creep, Dislocation climb

Affiliations des auteurs :

Ricardo A. Lebensohn ¹ ; R.A. Holt ² ; A. Caro ¹ ; A. Alankar ¹ ; C.N. Tomé ¹

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     author = {Ricardo A. Lebensohn and R.A. Holt and A. Caro and A. Alankar and C.N. Tom\'e},
     title = {Improved constitutive description of single crystal viscoplastic deformation by dislocation climb},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {289--295},
     publisher = {Elsevier},
     volume = {340},
     number = {4-5},
     year = {2012},
     doi = {10.1016/j.crme.2012.02.011},
     language = {en},
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Ricardo A. Lebensohn; R.A. Holt; A. Caro; A. Alankar; C.N. Tomé. Improved constitutive description of single crystal viscoplastic deformation by dislocation climb. Comptes Rendus. Mécanique, Volume 340 (2012) no. 4-5, pp. 289-295. doi : 10.1016/j.crme.2012.02.011. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.02.011/

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