Mechanical alloying during cryomilling of a 5000 Al alloy/AlN powder: the effect of contamination

Elemental powders of 80 vol% 5000 Al alloy (3 wt% Mg) and 20 vol% AlN were milled either in liquid nitrogen or at room temperature under argon. The milling of the mixture involved changes in the chemical composition: Fe contamination, oxidation and in-situ nitridation. The effects of milling time an...

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Bibliographic Details
Published in:Journal of alloys and compounds 2001-02, Vol.315 (1), p.276-283
Main Authors: Goujon, C, Goeuriot, P, Delcroix, P, Le Caër, G
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Exact sciences and technology
Mechanical alloying
Metal powders
Metals. Metallurgy
Mössbauer spectroscopy
Nanostructures
Powder metallurgy. Composite materials
Production techniques
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Summary:Elemental powders of 80 vol% 5000 Al alloy (3 wt% Mg) and 20 vol% AlN were milled either in liquid nitrogen or at room temperature under argon. The milling of the mixture involved changes in the chemical composition: Fe contamination, oxidation and in-situ nitridation. The effects of milling time and temperature on the contamination of the system were analysed. Oxidation and in-situ nitridation were characterized by a LECO analyser and thermal desorption measurements, whereas Mössbauer spectroscopy was used to study the mechanical alloying of the Al alloy. The results show that a metastable solid solution of Mg and Fe in Al is formed during cryomilling. The occurrence of mechanical alloying in spite of the very low milling temperature is interpreted as a consequence of the fine crystallite size of the Al matrix.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(00)01303-7