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An investigation on microstructure and creep behavior of an over-aged Al2024-10vol%SiC composite prepared by hot powder extrusion

Bakhshizadeh, N ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. Publisher: European Powder Metallurgy Association (EPMA) , 2007
  3. Abstract:
  4. In this study, the aging effect on microstructure and creep behavior of Al2024-10%SiC composite fabricated by powder metallurgy was studied. P/M bars were manufactured by hot powder extrusion method at 450°C with a ratio of 16 to1. Creep specimens were over-aged at 187°C for 43 h. It was found that almost full density composite with relatively homogenous distribution of the reinforcement particles throughout the aluminum alloy matrix can be attained by the direct powder extrusion process. Creep tests were conducted at temperatures of 275 to 325°C under stresses of 25 to 60 MPa. The creep tests revealed that the aged composites demonstrate a weaker creep behavior compared with non-aged samples. The analysis of the creep mechanism determined that dislocation climb was the vital mechanism of the deformation. The activation energy of the creep process was found to be higher than that of lattice selfdiffusion in pure aluminum
  5. Keywords:
  6. Activation energy ; Extrusion ; Metallic matrix composites ; Microstructure ; Powder metallurgy ; Silicon carbide ; Aging effects ; Al2024-SiC ; Aluminum alloy matrices ; Creep behaviors ; Creep mechanism ; Dislocation climb ; Powder extrusion ; Reinforcement particles ; Creep
  7. Source: European Powder Metallurgy Congress and Exhibition, Euro PM 2007, Toulouse, 15 October 2007 through 17 October 2007 ; Volume 2 , 2007 , Pages 345-352 ; 9781899072293 (ISBN)
  8. URL: https://www.epma.com/publications/euro-pm-proceedings/category/euro-pm2007