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Related Experiment Videos

Eutectic growth under acoustic levitation conditions.

W J Xie1, C D Cao, Y J Lü

  • 1Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China. lmss@nwpu.edu.cn

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 7, 2003
PubMed
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Acoustic levitation of lead-tin eutectic alloy enabled high undercooling, transforming its microstructure from lamellar to dendritic. Ultrasound-induced internal flow and surface vibrations influenced this transition and suppressed macrosegregation.

Area of Science:

  • Materials Science
  • Acoustic Levititation
  • Solidification Science

Background:

  • Lead-tin (Pb-Sn) eutectic alloys are critical in electronics.
  • Containerless processing is vital for studying alloy solidification under controlled conditions.
  • Acoustic levitation offers a unique platform for containerless melting and solidification.

Purpose of the Study:

  • To investigate the microstructural evolution of Pb-Sn eutectic alloy during containerless solidification.
  • To explore the effects of high undercooling and ultrasound on alloy microstructure.
  • To understand the mechanisms behind microstructural transitions and macrosegregation suppression.

Main Methods:

  • Containerless melting and solidification of Pb-Sn eutectic alloy using a single-axis acoustic levitator.

Related Experiment Videos

  • Achieving high undercooling (up to 38 K) in an argon atmosphere.
  • Analysis of microstructural transitions (lamellar to dendritic) and internal flow dynamics.

    • Main Results:

    • High undercooling led to a transition from lamellar to broken lamellar and finally to dendritic microstructures.
    • Complex internal flow, driven by shape oscillation, vibration, and rotation, suppressed gravity-induced macrosegregation.
    • Ultrasound induced surface vibrations, capillary ripples, and catalyzed surface nucleation.

    Conclusions:

    • Acoustic levitation facilitates containerless processing of Pb-Sn eutectic alloys, enabling high undercooling.
    • Internal fluid flow and surface effects induced by ultrasound are key factors controlling microstructure and macrosegregation.
    • This study provides insights into controlling alloy solidification through acoustic manipulation.