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

Published online by Cambridge University Press:  14 July 2011

Peng Yu ,
M. Balog ,
M. Yan ,
G.B. Schaffer  and
M. Qian
Peng Yu*
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Queensland 4072, Australia
M. Balog
Affiliation:
Institute of Materials and Machine Mechanics, SAS, Bratislava, Slovak Republic
M. Yan
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Queensland 4072, Australia
G.B. Schaffer
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Queensland 4072, Australia
M. Qian*
Affiliation:
The University of Queensland, School of Mechanical and Mining Engineering, ARC Centre of Excellence for Design in Light Metals, Queensland 4072, Australia
*
a)Address all correspondence to these authors. e-mail: yp1975@gmail.com
b)e-mail: ma.qain@uq.edu.au
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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 coefficient of thermal expansion up to 450 °C and may therefore have potential for selected elevated temperature applications.

Keywords

AlCompositePowder metallurgy
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 14 , 28 July 2011 , pp. 1719 - 1725
Copyright
Copyright © Materials Research Society 2011

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