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Thermal reactivity of Al–Mg–Li alloy powders

Published online by Cambridge University Press:  30 June 2015

Changjuan Xu ,
Hui Zou  and
Shuizhou Cai
Changjuan Xu
Affiliation:
State Key Laboratory of Material Processing and Die & Mould Technology, Institute of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Hui Zou
Affiliation:
State Key Laboratory of Digital Manufacturing and Equipment Technology, Institute of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Shuizhou Cai*
Affiliation:
State Key Laboratory of Material Processing and Die & Mould Technology, Institute of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China; and State Key Laboratory of Digital Manufacturing and Equipment Technology, Institute of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Oxidation of atomized Al–Mg–Li alloys with compositions ranging from Al0.85Mg0.1Li0.05 to Al0.55Mg0.4Li0.05 (wt%) was examined by thermogravimetry/differential thermal analysis. The results showed that oxidation proceeded in two steps. During the first step, lithium and magnesium were oxidized preferentially and removed from the metallic phase. The other step, during which the remainder of the metallic phase was oxidized, occurred over a wide range of temperature (989–1098 °C). The temperature of the second effect decreased slightly with increasing magnesium content from 10 to 30% in the alloy. For Al0.55Mg0.4Li0.05 alloy, the second exothermic peak occurred at 540 °C, and no exothermic peak was observed at higher temperature. The porous structure formed during the selective oxidation promotes the oxidation of residual Al in the alloy. Al0.55Mg0.4Li0.05 was oxidized completely at 1100 °C, lower than the temperature of other alloys. The thermite reaction experiment of Al0.55Mg0.4Li0.05–Fe2O3 system conducted in Ar showed a reaction temperature of 587 °C, significantly lower than the reaction temperature observed for Al–Fe2O3 system.

Keywords

alloypowderoxidation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 14 , 28 July 2015 , pp. 2238 - 2246
Copyright
Copyright © Materials Research Society 2015 

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