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Reduction of Surface Oxide Films in Al–Mg Alloy Powders by Pulse Electric Current Sintering

Published online by Cambridge University Press:  03 March 2011

Guoqiang Xie ,
Osamu Ohashi ,
Norio Yamaguchi ,
Minghui Song ,
Kazutaka Mitsuishi ,
Kazuo Furuya  and
Tetsuji Noda
Guoqiang Xie*
Affiliation:
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
Osamu Ohashi
Affiliation:
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
Norio Yamaguchi
Affiliation:
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
Minghui Song
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
Kazutaka Mitsuishi
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
Kazuo Furuya
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
Tetsuji Noda
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
*
a)Address all correspondence to this author. Present address: Nanocharacterization Group, Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan. e-mail: [email protected]
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Abstract

The reduction mechanism of particle surface oxide films on Al–Mg alloy specimens sintered by the pulse electric current sintering (PECS) process was investigated via transmission electron microscopy, energy dispersive x-ray spectroscopy, and thermodynamic calculation. The reduction products were either MgAl2O4 or MgO or both, which is dependent on the sintering temperature and Mg content in Al–Mg alloy. Comparing the experimental temperature of the reduction products with that from thermodynamic calculation, it was suggested that the temperature at interfaces between particles was higher than that inside particles. This difference of temperature enhanced reduction of surface oxide films of Al–Mg alloy powders and hence accelerated the sintering in the PECS process.

Keywords

Transmission electron microscopy (TEM)Chemical reactionSintering
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 815 - 819
Copyright
Copyright © Materials Research Society 2004

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