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Microstructure and Wear Behavior of Solidification Sonoprocessed B390 Hypereutectic Al-Si Alloy

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Abstract

The hypereutectic Al-Si alloys constitute an important family of alloys because of their excellent wear resistance and low thermal expansion. However, the optimal microstructure and hence the optimal service performance of these alloys cannot be achieved by the conventional melt treatments used in industry today, because of the chemical incompatibility between the primary-Si refiners and the eutectic-Si modifiers used in microstructure control. The current study aimed at using ultrasonic vibrations to improve the microstructure and the properties of these alloys. The results of the current study showed that for the B390 Al-Si alloy (i) the ultrasonic treatment has potential refining effect on the primary Si and Fe intermetallic phases, (ii) the primary Si particles become finer as the pouring temperature decreases from 1033 K (760 °C) to 938 K (665 °C), (iii) pouring and ultrasonic treatment at temperatures below the start of primary Si precipitation result in the coexistence of large and fine Si particles in microstructure, (iv) phosphorous additions of 50 ppm did not show any substantial effect in the ultrasonically treated ingots, (v) ultrasonic-treated samples have uniform hardness over the surface while the untreated samples show large scattering (high standard deviation) in hardness levels and (vi) ultrasonic-treated samples showed better wear resistance in the absence of phosphorous.

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Acknowledgments

The authors would like to thank the group of “Materials Processing Laboratory,” Toyota Technological Institute- Japan, where the UST experiments were performed, and the “Foundry Technology Division,” Central Metallurgical R&D Institute-Egypt, where some microstructural studies and wear tests were performed.

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Authors and Affiliations

  1. Department of Mining, Petroleum and Metallurgical, Engineering, Faculty of Engineering, Cairo University, 12613, Giza, Egypt

    Waleed Khalifa (Associate Professor)

  2. Central Metallurgical Research&Development Institute, P.O. Box 87, Helwan-El-Tebbin, Cairo, Egypt

    Shimaa El-Hadad (Researcher)

  3. Toyota Technological Institute, 2-12-1, Hisakata, Tempaku, Nagoya, 468-8511, Japan

    Yoshiki Tsunekawa (Professor)

Authors
  1. Waleed Khalifa
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  2. Shimaa El-Hadad
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  3. Yoshiki Tsunekawa
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Corresponding author

Correspondence to Shimaa El-Hadad.

Additional information

Manuscript submitted September 10, 2012.

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Khalifa, W., El-Hadad, S. & Tsunekawa, Y. Microstructure and Wear Behavior of Solidification Sonoprocessed B390 Hypereutectic Al-Si Alloy. Metall Mater Trans A 44, 5817–5824 (2013). https://doi.org/10.1007/s11661-013-1936-z

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  • DOI: https://doi.org/10.1007/s11661-013-1936-z

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