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Processing of Al-20Si-5Fe-2X(X=Cu, Ni, Cr) alloys by melt-spinning and hot-pressing

Rajabi, M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: European Powder Metallurgy Association (EPMA) , 2008
  3. Abstract:
  4. Al-20Si-5Fe-2X (X=Cu, Ni, Cr) ribbons were produced by melt-spinning and consolidated by hot pressing at 400°C for 60 min. Optical and transmission electron microscopy (TEM), X-ray diffractometry (XRD), and hardness test were used to evaluate the microstructure and mechanical strength of the ribbons and hot consolidated specimens. The compressive strength of the specimens at ambient and elevated temperatures was also examined. The microstructure of the ribbons exhibited featureless and dendritic zones, and contains spherically-shaped Si particles with an average diameter of 20 nm. After hot-pressing, ultrafine Si (110-150 nm) and iron-containing intermetallic particles were formed. The results of the mechanical tests indicated the advantages of melt-spinning compared with casting due to the microstructural refinement
  5. Keywords:
  6. Compressive strength ; Hot pressing ; Iron alloys ; Microstructure ; Nickel ; Powder metallurgy ; Rapid solidification ; Silicon ; Strength of materials ; Transmission electron microscopy ; X ray diffraction analysis ; Average diameter ; Elevated temperature ; Iron containing intermetallics ; Microstructural refinement ; Si-particle ; Ultrafine ; XRD ; Aluminum
  7. Source: European International Powder Metallurgy Congress and Exhibition, Euro PM 2008, Mannheim, 29 September 2008 through 1 October 2008 ; Volume 2 , 2008 , Pages 99-104 ; 9781899072033 (ISBN)