Effect of interfacial reaction on bending strength of Al18B4O33 whisker-reinforced aluminum composites

L. J. Yao*, G. Sasaki, J. Pan, M. Yoshida, H. Fukunaga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The present study deals with the mechanism of the interfacial reaction and the microstructure of the interface in aluminum borate whisker-reinforced pure aluminum matrix composites prepared by a squeeze casting process. By means of X-ray diffraction analysis (XRDA), differential thermal analysis (DTA), scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM), it has been found that no interfacial reaction occurred under the as-cast condition, whereas aluminum reacted with the whiskers when the composite was reheated at a temperature higher than 726 °C. The reaction produced γ-Al2O3. Based on HRTEM observation, it is considered that the whiskers bond to the aluminum matrix directly after squeeze casting. The observation also shows that there is a specific orientation relationship between the reaction product and whisker, {002} Al18B4O33 ∥ {220} γ-Al2O3, 〈200〉 Al18B4O33 ∥ 〈111〉 γ-Al2O3, which leads to a coherent interface with a mismatch of less than 1 pet. The interfacial bonding state changed after heating under different conditions. Propagation of cracks in each interfacial state was observed by SEM, and the effects of the interfacial reaction on the bending strength were studied with the microstructure of the interface.

Original languageEnglish
Pages (from-to)1517-1524
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number5
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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