The effect of tin and nitrogen on liquid phase sintering of Al-Cu-Mg-Si alloys

Schaffer, G.B., Yao, J.Y., Bonner, S. J., Crossin, E., Pas, S. J and Hill, A. J. (2008) The effect of tin and nitrogen on liquid phase sintering of Al-Cu-Mg-Si alloys. Acta Materialia, 56 11: 2615-2624. doi:10.1016/j.actamat.2008.01.047

Author Schaffer, G.B.
Yao, J.Y.
Bonner, S. J.
Crossin, E.
Pas, S. J
Hill, A. J.
Title The effect of tin and nitrogen on liquid phase sintering of Al-Cu-Mg-Si alloys
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2008-06-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.actamat.2008.01.047
Open Access Status Not yet assessed
Volume 56
Issue 11
Start page 2615
End page 2624
Total pages 10
Editor Mahajan, S.
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
861203 Metal Castings
091207 Metals and Alloy Materials
Abstract Alloys of Al-3.8Cu-1Mg, Al-3.8Cu-1Mg-0.7Si, Al-3.8Cu-1Mg-0.1Sn and Al-3.8Cu-1Mg-0.7Si-0.1Sn were made using elemental powders and conventional press-and-sinter powder metallurgy techniques. The sintering of these alloys was studied at 590 °C under atmospheres of nitrogen or argon using a horizontally aligned, push-rod dilatometer. Sintered samples were characterized using scanning electron microscopy and positron annihilation lifetime spectroscopy. Under argon, shrinkage occurs in a single stage and the shrinkage rate decays monotonically over time. Sintering shrinkage under nitrogen occurs in three distinct stages and the rate increases over time. Tin decreases shrinkage under argon but activates shrinkage under nitrogen. Positron spectroscopy indicates that the presence of tin does not alter the vacancy concentration in the sintered alloys, suggesting that tin does not bind preferentially to vacancies in the aluminum matrix in these AlCuMgSi alloys. Rather, it appears that tin may limit the formation of aluminum nitride on specific surfaces.
Keyword Aluminum
Liquid phase sintering
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: 2009 Higher Education Research Data Collection
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Created: Fri, 10 Apr 2009, 02:07:47 EST by Sally Beard on behalf of Materials