The effects of sample position and gas flow pattern on the sintering of a 7xxx aluminum alloy

Yuan, X. N., Aminossadati, S. M., Huo, S. H., Schaffer, G. B. and Qian, M. (2012) The effects of sample position and gas flow pattern on the sintering of a 7xxx aluminum alloy. Metallurgical and Materials Transactions A, 43 11: 4345-4355. doi:10.1007/s11661-012-1227-0

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Author Yuan, X. N.
Aminossadati, S. M.
Huo, S. H.
Schaffer, G. B.
Qian, M.
Title The effects of sample position and gas flow pattern on the sintering of a 7xxx aluminum alloy
Journal name Metallurgical and Materials Transactions A   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2012-11
Sub-type Article (original research)
DOI 10.1007/s11661-012-1227-0
Open Access Status File (Author Post-print)
Volume 43
Issue 11
Start page 4345
End page 4355
Total pages 11
Place of publication New York, NY United States
Publisher Springer New York LLC
Collection year 2013
Language eng
Formatted abstract
The effects of sample position and gas flow pattern on the sintering of a 7xxx aluminum alloy Al-7Zn-2.5Mg-1Cu in flowing nitrogen have been investigated both experimentally and numerically. The near-surface pore distribution and sintered density of the samples show a strong dependency on the sample separation distance over the range from 2 mm to 40 mm. The open porosity in each sample increases with increasing separation distance while the closed porosity remains essentially unchanged. A two-dimensional computational fluid dynamics (CFD) model has been developed to analyze the gas flow behavior near the sample surfaces during isothermal sintering. The streamlines, velocity profile, and volume flow rate in the cavity between each two samples are presented as a function of the sample separation distance at a fixed nitrogen flow rate of 6 L/min. The CFD modeling results provide essential details for understanding the near-surface pore distribution and density of the sintered samples. It is proposed that the different gas flow patterns near the sample surfaces result in variations of the oxygen content from the incoming nitrogen flow in the local sintering atmosphere, which affects the self-gettering process of the aluminum compacts during sintering. This leads to the development
of different near-surface pore distributions and sintered densities.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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Created: Tue, 23 Oct 2012, 10:40:59 EST by Dr Saiied Aminossadati on behalf of School of Mechanical and Mining Engineering