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Flow stress dependence on the grain size in alumina dispersion-strengthened copper with a bimodal grain size distribution

Afshar, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2009.04.022
  3. Publisher: 2009
  4. Abstract:
  5. The grain size dependence of flow stress in Cu-2.7 vol.%Al2O3 (15 nm) composite with a bimodal structure was studied. It is shown that the yield strength obeys the Hall-Petch equation when an appropriate value of average grain size based on the "rule of mixture" is employed. The Hall-Petch constants (σ0ε and kε) are proportional to strain as ε0.5. An equation for flow stress as a function of true strain and average grain size is proposed. The effect of alumina nanoparticles on the yield strength is shown to be related to large amounts of dislocations density. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Alumina ; Copper ; Nanocomposite ; Alumina dispersions ; Alumina Nanoparticle ; Average grain size ; Bimodal grain-size distribution ; Bimodal structures ; Dislocations densities ; Flow stress ; Grain size ; Grain size dependence ; Hall-petch ; Hall-Petch equation ; Hall-Petch relation ; Rule of mixture ; True strain ; Yield strength ; Copper ; Nanocomposites ; Plastic flow ; Yield stress ; Grain size and shape
  8. Source: Materials Science and Engineering A ; Volume 518, Issue 1-2 , 2009 , Pages 41-46 ; 09215093 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921509309005085