In situ fabrication and mechanical properties of Al-AlN composite by hot extrusion of partially nitrided AA6061 powder

Yu, Peng, Balog, M., Yan, M., Schaffer, G. B. and Qian, M. (2011) In situ fabrication and mechanical properties of Al-AlN composite by hot extrusion of partially nitrided AA6061 powder. Journal of Materials Research, 26 14: 1719-1725. doi:10.1557/jmr.2011.143


Author Yu, Peng
Balog, M.
Yan, M.
Schaffer, G. B.
Qian, M.
Title In situ fabrication and mechanical properties of Al-AlN composite by hot extrusion of partially nitrided AA6061 powder
Journal name Journal of Materials Research   Check publisher's open access policy
ISSN 0884-2914
2044-5326
Publication date 2011-07
Sub-type Article (original research)
DOI 10.1557/jmr.2011.143
Volume 26
Issue 14
Start page 1719
End page 1725
Total pages 7
Place of publication New York, United States
Publisher Cambridge University Press
Collection year 2012
Language eng
Formatted abstract
Al–AlN composite powders containing 9–55 vol%AlN were fabricated in situ by nitriding a powder mixture of AA6061–2% Mg–1% Sn at 560 °C. Transmission electron microscopy (TEM) revealed that the in situ formed AlN reinforcements are present as nanoscale AlN whiskers on each powder particle. The composite powder was consolidated by hot extrusion at 450 °C with an extrusion ratio of 11:1. This produced an AlN-free and an AlN-containing lamellar structure along the extrusion direction. The nanoscale AlN is dispersed in the AlN-containing lamella and shows excellent bonding with the Al matrix, free of decohesion and voids. The lamellar composite containing 9 vol%AlN has an ultimate tensile strength of 332 MPa and tensile elongation of 3%. Composites containing ≥17.5 vol%AlN achieve much higher tensile strengths (538 MPa) but zero tensile elongation. However, they show a low coef´Čücient of thermal expansion up to 450 °C and may therefore have potential for selected elevated temperature applications. 
Keyword Matrix Composite
Aluminum
Infiltration
Nitridation
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 2012 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
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