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Microstructural features of rapidly solidified Al-20Si-5Fe-2X(X=Cu, Ni, Cr) powders

Rajabi, M ; 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. The size and morphology of secondary phase and intermetallic compounds in gas atomized Al- 20Si-5Fe-2X (X=Cu, Ni, Cr) powders were studied. It was shown that the microstructure compromised of fine particle-like primary Si, aciculate δ-Al9FeSi3 intermetallic compound containing small amount of dissolved alloying elements, and fine Al-Si eutectic matrix. Decreasing the powder particle size yields finer primary silicon but its morphology is not affected. Also, significant refinement in the size of δ-Al9FeSi3 intermetallic was observed as the particles become finer. This particle size effect on the microstructure of Al-20Si-5Fe alloy was found to be influenced by the presence of chromium. Here, the morphology of δ-intermetallic compound was changed from acicular to particle-like when the size of particles is <38 μm. The microstructural refinement by controlling the particle size leads to an increase in the hardness of the powder particles in the amount of 7-17% dependent on the composition
  5. Keywords:
  6. Alloying elements ; Intermetallics ; Iron alloys ; Iron compounds ; Microstructural evolution ; Microstructure ; Morphology ; Nickel ; Particle size ; Powder metallurgy ; Powders ; Rapid solidification ; Silicon ; Soldering alloys ; Al-Si eutectic ; Microstructural features ; Microstructural refinement ; Particle size effect ; Powder particles ; Primary silicon ; Rapidly solidified ; Secondary phase ; Aluminum
  7. Source: European Powder Metallurgy Congress and Exhibition, Euro PM 2007, Toulouse, 15 October 2007 through 17 October 2007 ; Volume 2 , 2007 , Pages 3-8 ; 9781899072293 (ISBN)
  8. URL: https://www.researchgate.net/publication/289563068_Microstructural_features_of_rapidly_solidified_Al-20Si-5Fe-2XXCu_Ni_Cr_powders