Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 12, Pages 4248-4254Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.02.029
Keywords
Al-25Si-5Fe-3Cu alloy; Spray forming; Microstructural evolution
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Funding
- National Basic Research Program of China [2006CB605204]
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The hypereutectic Al-Si-Fe alloys with different Mn and Cr addition were synthesized by spray forming technique, and the microstructural evolutions induced by Mn and Cr have been investigated using field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that the modification effect of co-addition of Mn and Cr is more effective than the individual Mn or Cr addition in transforming harmful rod-like Fe-bearing beta phase to particulate alpha-phase. Meanwhile, the modification effect of Cr is superior to that induced by Mn. The Mn/Cr ratio plays an important role in the combined addition. The addition of 2 wt% Mn + 1 wt% Cr to spray formed alloy has induced an ideal microstructure with entirely fine granular intermetallic compounds dispersed in Al matrix. DSC analyses indicate that both Mn and Cr can greatly influence the onset temperatures and the region widths of primary Si, delta phase and alpha phase, but bring little changes on multi-phase reaction, which would contribute to the modification effects of Mn, Cr and Mn + Cr. (C) 2011 Elsevier B.V. All rights reserved.
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