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Mechanical behavior during aging of plastically deformed AA6061-SiCp composite in different temperatures

Sadeghi, I | 2012

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  1. Type of Document: Article
  2. DOI: 10.1177/1464420712444387
  3. Publisher: SAGE , 2012
  4. Abstract:
  5. In this study, the kinetics of aging in AA6061 and AA6061 with 5% volume fraction SiCp were studied and compared. The composite was first produced and homogenized using stir casting technique followed by hot extrusion with the ratio of 18:1. Then, both AA6061 and the composite were aged at three different temperatures including room temperature, 170 °C and 240 °C, while mechanical properties during aging were evaluated employing hardness measurements and tensile testing. Moreover, in order to assess the effect of plastic deformation on the kinetics of aging, a series of samples were first deformed by equal-channel angular pressing immediately after solution treatment and then aged in the above-mentioned temperatures. The results indicate that the aging activation energy of the composite is reduced from 108.7 to 80.5 kJ/mole when the composite is subjected to cold deformation prior to aging. Furthermore, a combination of equal-channel angular pressing and subsequent aging at 170 °C gives the highest strength with the moderate ductility compared to the undeformed composite and the original AA6061
  6. Keywords:
  7. Mechanical properties ; Metal-matrix composite ; Severe plastic deformation ; Cold deformation ; Hardness measurement ; Hot extrusion ; Mechanical behavior ; Metal matrix composites ; Room temperature ; Severe plastic deformations ; Solution treatments ; Stir casting ; Strain aging ; Activation energy ; Aluminum alloys ; Metallic matrix composites ; Plastic deformation ; Pressing (forming) ; Strain ; Tensile testing ; Polymer matrix composites
  8. Source: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications ; Volume 226, Issue 4 , 2012 , Pages 322-329 ; 14644207 (ISSN)
  9. URL: http://pil.sagepub.com/content/226/4/322