Metall. Res. Technol.
Volume 112, Number 3, 2015
|Number of page(s)||10|
|Published online||13 May 2015|
A356 alloy foam fabrication by melting method using titanium hydride
Accepted: 13 April 2015
Metallic foams have been of considerable interest both from the industrial applicability and scientific viewpoint. Nevertheless, besides the cost aspects, there are a lot of technical improvements necessary in order to gain more widespread use. The present study focused on thermal decomposition behavior of titanium hydride on the melt foaming during casting and unidirectional solidification of A356 alloy. Therefore, the effects of heating temperature, stirring time and TiH2 wt. %, on percentage of porosity have been investigated. It was found that under optimum torque-temperature conditions and TiH2 addition of 1.0–1.5 wt. %, a remarkable foaming efficiency could be achieved. Foamed A356 cross-sections were microscopically characterized by Scanning Electron Microscopy corresponding to different TiH2 contents. The optimum amount of titanium hydride content induces uniformity in porosity cell structure distribution in the whole cross section of the foamed aluminum. Medium thickness of thin cell wall is near to 20 μm which is easily broken or disrupted.
Key words: A356 alloy / TiH2wt. % / foamed structure / semi solid processing / density
© EDP Sciences 2015
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