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Effects of stored strain energy on restoration mechanisms and texture components in an aluminum-magnesium alloy prepared by friction stir processing

Khodabakhshi, F ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2015.07.001
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. Plates of AA5052 (Al-Mg) alloy in both annealed (solution-treated) and wrought (rolled) temper conditions were subjected to friction stir processing (FSP) at various w/. v pitch ratios from 4 to 28. rev.min/mm. The role of stored strain energy on the evolution of restoration mechanisms and crystallographic texture components were assessed in terms of microstructural features evaluated using electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) analysis. The results revealed that FSP significantly refined the grain structure and changed the crystallographic micro-texture components. The grain size of the annealed and wrought alloy was reduced from 49.4 and 9.7. μm initial values to 3.3 and 3.6. μm, respectively when w/. v=4. Also, the formation of a {112}. [U+27E8]. 110. [U+27E9] crystallographic shear texture with a strong B/B component intensity were observed. The microstructural changes in the annealed alloy were related to the occurrence of discontinuous dynamic recrystallization (DDRX) mechanism, while operation of a static recrystallization (SRX) prior to a continuous (CDRX) mode in the wrought one, revealing the effect of stored strain energy. Evaluations of the mechanical properties also determined enhanced ultimate tensile strength, elongation, and indentation Vickers hardness while preserving the yield stress
  6. Keywords:
  7. AA5052 aluminum alloy ; Recrystallization ; Stored strain energy ; Alloys ; Aluminum ; Aluminum alloys ; Annealing ; Crystal microstructure ; Crystallization ; Dynamic recrystallization ; Friction ; Friction stir welding ; Grain size and shape ; Magnesium alloys ; Microstructural evolution ; Recrystallization (metallurgy) ; Restoration ; Stainless steel ; Stresses ; Tensile strength ; Textures ; Transmission electron microscopy ; Tribology ; Vickers hardness ; Yield stress ; Aluminum - Magnesium alloys ; Crystallographic textures ; Discontinuous dynamic recrystallization ; Electron back-scattered diffraction ; Friction stir processing ; Microstructural features ; Static recrystallization ; Ultimate tensile strength ; Strain energy
  8. Source: Materials Science and Engineering A ; Volume 642 , August , 2015 , Pages 204-214 ; 09215093 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921509315301556