Long-gang Hou, Yuan-hua Cai, Hua Cui,  and Ji-shan Zhang, Microstructure evolution and phase transformation of traditional cast and spray-formed hypereutectic aluminium-silicon alloys induced by heat treatment, Int. J. Miner. Metall. Mater., 17(2010), No. 3, pp. 297-306. https://doi.org/10.1007/s12613-010-0308-6
Cite this article as:
Long-gang Hou, Yuan-hua Cai, Hua Cui,  and Ji-shan Zhang, Microstructure evolution and phase transformation of traditional cast and spray-formed hypereutectic aluminium-silicon alloys induced by heat treatment, Int. J. Miner. Metall. Mater., 17(2010), No. 3, pp. 297-306. https://doi.org/10.1007/s12613-010-0308-6

Microstructure evolution and phase transformation of traditional cast and spray-formed hypereutectic aluminium-silicon alloys induced by heat treatment

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  • Corresponding author:

    Long-gang Hou    E-mail: lghou@live.com

  • Received: 14 June 2009Revised: 8 July 2009Accepted: 20 July 2009
  • Microstructural evolution and phase transformation induced by different heat treatments of the hypereutectic aluminium-silicon alloy, Al-25Si-5Fe-3Cu (wt%, signed as 3C), fabricated by traditional cast (TC) and spray forming (SF) processes, were investigated by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy and X-ray diffraction techniques. The results show that Al7Cu2Fe phase can be formed and transformed in TC- and SF-3C alloys between 802–813 K and 800–815 K, respectively. The transformation from β-Al5FeSi to δ-Al4FeSi2 phase via peritectic reaction can occur at around 858–870 K and 876–890 K in TC- and SF-3C alloys, respectively. The starting precipitation temperature of δ-Al4FeSi2 phase as the dominant Fe-bearing phase in the TC-3C alloy is 997 K and the exothermic peak about the peritectic transformation of δ-Al4FeSi2→β-Al5FeSi is not detected in the present DSC experiments. Also, the mechanisms of the microstructural evolution and phase transformation are discussed.
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