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Microstructure on Inner Surface of Cell Walls inside Aluminum Alloy Foam Fabricated via Semi-Solid Route

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Abstract:

For the fabrication of aluminum alloy foams, TiH2 is used as a foaming agent. However, the detailed aspect of TiH2 after fabrication is unclear. The objective is to reveal the aspect of TiH2 by observing the inner surface of pores. The aluminum alloy foam was fabricated by adding TiH2 into hypoeutectic Al-Si alloy in the semi-solid state and subsequent solidification. The stereo microscopic images and Scanning Electron Microscope images on the inner surface showed that many small angular particles were fixed on the surface. According to the element mapping on the gas-solid interface, it was revealed that those angular particles contained Ti inside. Based on the nominal particle size of the titanium hydride powder used in this study, these small particles are considered to be derived from titanium hydride. Additionally, hydrogen was released during Thermogravimetry-Differential Thermal Analysis and Mass Spectrometry. The results indicate that the titanium hydride was not completely decomposed during the foaming process.

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Info:

Periodical:

Key Engineering Materials (Volume 1059)

Pages:

15-23

DOI:

https://doi.org/10.4028/p-O4Umgq

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Online since:

June 2026

Authors:

Satomi Takamatsu*, Natsumi Tsuchida, Shinsuke Suzuki

Keywords:

Al-Si Alloy, Aluminum Alloy Foam, Foaming, Porous Metal, Semi-Solid Route, Titanium Hydride

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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