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Structure and properties of Al–Mg mechanical alloys

Published online by Cambridge University Press:  31 January 2011

Mirko Schoenitz  and
Edward L. Dreizin
Mirko Schoenitz
Affiliation:
New Jersey Institute of Technology, Department of Mechanical Engineering, University Heights, Newark, New Jersey 07102
Edward L. Dreizin
Affiliation:
New Jersey Institute of Technology, Department of Mechanical Engineering, University Heights, Newark, New Jersey 07102
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Abstract

Mechanically alloys in the Al–Mg binary system in the range of 5–50 at.% Mg were produced for prospective use as metallic additives for propellants and explosives. Structure and composition of the alloys were characterized by x-ray diffraction microscopy (XRD) and scanning electron microscopy. The mechanical alloys consisted of a supersaturated solid solution of Mg in the α aluminum phase, γ phase (Al12Mg17), and additional amorphous material. The strongest supersaturation of Mg in the α phase (20.8%) was observed for bulk Mg concentrations up to 40%. At 30% Mg, the γ phase formed in quantities detectable by XRD; it became the dominating phase for higher Mg concentrations. No β phase (Al3Mg2) was detected in the mechanical alloys. The observed Al solid solution generally had a lower Mg concentration than the bulk composition. Thermal stability and structural transitions were investigated by differential scanning calorimetry. Several exothermic transitions, attributed to the crystallization of β and γ phases were observed. The present work provides the experimental basis for the development of detailed combustion and ignition models for these novel energetic materials.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 8 , August 2003 , pp. 1827 - 1836
Copyright
Copyright © Materials Research Society 2003

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