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Dislocation structure and strength evolution of heavily deformed tantalum

Hosseini, E ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijrmhm.2008.09.006
  3. Publisher: 2009
  4. Abstract:
  5. A unified model composed of the flow function model, dislocation model and Taylor theory is used to investigate the evolution of dislocation density, cell size, and strength of tantalum during ECAP process. From the flow function model, strain and strain rate distributions are achieved and then using a modified version of three-dimensional ETMB model, the dislocation density, cell size, and strength are predicted. The predicted dislocation density, cell size, and strength are compared with the experimental data and a remarkable agreement is obtained. In addition, the effect of dynamic recovery on the strength of the processed tantalum is modeled and compared with other materials. © 2008 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Plastic deformation ; Tantalum ; Three dimensional ; Transition metals ; Cell sizes ; Dislocation densities ; Dislocation models ; Dislocation structure ; Dynamic recovery ; Experimental datum ; Flow functions ; Heavily deformed ; Rate distributions ; Severe plastic deformation ; Strength ; Taylor theories ; Unified models ; Strain rate
  8. Source: International Journal of Refractory Metals and Hard Materials ; Volume 27, Issue 3 , 2009 , Pages 605-610 ; 02634368 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0263436808001157