Incorporation of Alumina Particles with Different Shapes and Sizes into Molten Aluminum Alloy by Melt Stirring with Ultrasonic Vibration

• Genma Yoshikazu

  Toyota Technological Institute

• Tsunekawa Yoshiki

  Toyota Technological Institute

• Okumiya Masahiro

  Toyota Technological Institute

• Mohri Naotake

  Toyota Technological Institute

Bibliographic Information

Other Title

• Incorporation of Alumina Particles with

Abstract

This paper presents the influence of particle shapes and sizes on the incorporation of Al₂O₃ particles into molten Al-5 mass%Mg alloy by melt stirring with ultrasonic vibration. A new theoretical model of particle transfer into molten metal dealing with different shapes is proposed to estimate the difficulty in incorporation of spherical and massive particles. In the model, the particles are assumed to be spheroids with different major and minor axes. The difficulty depends on the maximum acceleration which originates from the interfacial tension: the incorporation of Al₂O₃ particles into molten Al–Mg alloy becomes more difficult with the negative maximum acceleration increased. Four kinds of preheated Al₂O₃ particles were added to a molten Al-5 mass%Mg alloy surface and stirred with ultrasonic vibration at 1023 K in a nitrogen atmosphere. The volume fraction of incorporated particles is related to the calculated maximum acceleration; that is, it is experimentally found to decrease as the negative maximum acceleration increased. According to the proposed model, the ultrasonic vibration makes the apparent contact angle of the Al₂O₃ particle and the molten Al–Mg alloy improve from 1.78 to 0.87 rad. Gas defects, which are known to be a serious problem in metal matrix composites (MMC) produced by melt stirring, disappear in MMC samples formed with ultrasonic vibration. Moreover, the rotating torque for melt stirring decreases by applying ultrasonic vibration, because of the decomposition of agglomerate particles. Hence, the application of ultrasonic vibration to melt stirring is a novel candidate method of MMC production.

Journal

• Materials Transactions, JIM

  Materials Transactions, JIM 38 (3), 232-239, 1997

  The Japan Institute of Metals

Keywords

• metal matrix composite
• alumina particle
• molten aluminum-magnesium alloy
• ultrasonic vibration
• melt stirring
• composite slurry
• particle shape
• contact angle
• gas defect

Details

• CRID: 1390282679223819520
• NII Article ID: 130003556904
• NII Article ID: 10002452068
• NII Book ID: AA10699969
• DOI: 10.2320/matertrans1989.38.232
• COI: 1:CAS:528:DyaK2sXjtVOhsr8%3D
• ISSN: 2432471X
• ISSN: 09161821
• ISSN: http://id.crossref.org/issn/09161821
• NDL BIB ID: 4209539
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4209539
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1989/38/3/38_3_232/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed