A morphological study of nitride formed on Al at low temperature in the presence of Mg

Kent, D., Drennan, J. and Schaffer, G.B. (2011) A morphological study of nitride formed on Al at low temperature in the presence of Mg. Acta Materialia, 59 6: 2469-2480.


Author Kent, D.
Drennan, J.
Schaffer, G.B.
Title A morphological study of nitride formed on Al at low temperature in the presence of Mg
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2011-04-01
Sub-type Article (original research)
DOI 10.1016/j.actamat.2010.12.050
Volume 59
Issue 6
Start page 2469
End page 2480
Total pages 12
Place of publication United Kingdom, United States
Publisher Pergamon
Collection year 2012
Language eng
Abstract A detailed study was conducted of AlN formed at low temperature on Al with the aid of Mg. The nitride exhibits a bilayer structure comprising a layer forming outward and a layer growing into the Al. In its early stages of formation the outward forming layer consists of fine, randomly aligned AlN crystallites dispersed within an Al matrix. The later forming outer region is primarily composed of fine, columnar hexagonal AlN crystallites aligned in the growth direction, in conjunction with small amounts of fine polycrystalline Al. The inward forming layer comprises nodules, regions or layers of reacted Al, containing a mixture of fine polycrystalline AlN and Al, in conjunction with Al exhibiting the original Al crystal structure. A fine-grained, Mg-containing nitride approximately 150 nm thick was observed at the interface of the outward forming layer with either the underlying Al substrate or the inward forming layer when it is present. A mechanism is proposed for the formation of the nitride and the development of the bilayer structure. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword Aluminium
Nitridation
Nitrides
Surface structure
Transmission electron microscopy (TEM)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Received 16 November 2010; accepted 24 December 2010. Available online 2 February 2011

 
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Created: Fri, 04 Mar 2011, 17:53:05 EST by Mr Damon Kent on behalf of School of Mechanical and Mining Engineering