Al-AIN composites consolidated from partially nitride aluminum alloy powders by Equal Channel Angular Pressing (ECAP)

Yu, Peng, Bettles, Colleen, Schaffer, G. B. and Qian, Ma (2010). Al-AIN composites consolidated from partially nitride aluminum alloy powders by Equal Channel Angular Pressing (ECAP). In: , Proceedings of Powder Metallurgy World Congress & Exhibition. PM2010. Powder Metallurgy World Congress - World PM2010, Florence, Italy, (71-78). 10-14 October 2010.

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Author Yu, Peng
Bettles, Colleen
Schaffer, G. B.
Qian, Ma
Title of paper Al-AIN composites consolidated from partially nitride aluminum alloy powders by Equal Channel Angular Pressing (ECAP)
Conference name Powder Metallurgy World Congress - World PM2010
Conference location Florence, Italy
Conference dates 10-14 October 2010
Proceedings title Proceedings of Powder Metallurgy World Congress & Exhibition. PM2010
Place of Publication Shrewsbury, United Kingdom
Publisher European Powder Metallurgy Association
Publication Year 2010
Sub-type Fully published paper
ISBN 9781899072132
9781899072118
189907211X
1899072136
Volume 4
Start page 71
End page 78
Total pages 8
Collection year 2011
Language eng
Abstract/Summary Al-AlN composite powders were fabricated through nitriding aluminium powder mixtures of AA 6061-2%Mg-1%Sn-3%Nylon at 560 °C in nitrogen at atmospheric pressure. Each nitrided particle is enveloped by an in-situ formed AlN shell, which is a nanocomposite of Al-AlN, comprising nanoscale AlN whiskers and an Al matrix. The thickness of the ‘AlN shell’ increases with nitridation time, through which the AlN content can be readily controlled. The partially nitrided powders were consolidated using back pressure-assisted Equal Channel Angular Pressing (ECAP) at 200 °C, with a view to dispersing the nanoscale AlN. It was found that the processing behaviours of the Al-AlN composite powders were significantly affected by the AlN content. The ‘AlN shells’ were difficult to fragment as they deformed readily during ECAP. As a result, agglomeration or segregation of the AlN phase was observed after multi-passes of ECAP, particularly at large volume fractions. The attendant microstructures show shear banding and surface cracking when the AlN content is more than 20 vol.%. However, at a low volume fraction of AlN (8.9%), multi-passes of ECAP resulted in a dense Al-AlN microstructure with a reasonable dispersion of the AlN in the matrix.
Keyword Al-AlN
Equal channel angular pressing (ECAP)
Nitriding
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes v. : ill. ; 29 cm. Session 11: Aluminium Matrix Composites

 
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Created: Fri, 25 Mar 2011, 15:35:38 EST by Sally Beard on behalf of School of Mechanical and Mining Engineering