Formation of intermetallic compound in iron-aluminum alloys |
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| Authors: | Xingqing Wang J V Wood Yongjiang Sui Haibo Lu |
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| Institution: | (1) School of Material Science and Engineering, Shanghai University, 149 Yanchang Road, 200072 Shanghai;(2) University of Nottingham, UK;(3) Central South University of Technology, China |
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| Abstract: | The mechanism of iron and aluminum intermetallics formation in the reactive sintering of iron and aluminum mixing powders
has been studied by investigating iron-aluminum diffusion couples. The couples were treated at 600°C, 700°C, 800°C, 900°C
and 1000°C respectively. It was found that an Al-rich intermetallics FeAl3 has formed in iron adjacent to the interface of iron and aluminum by aluminum diffusion into iron at 600°C (below the eutectic
temperature), and that in the case above 700°C (above the eutectic temperature) there was a liquid, an intermetallics Fe2Al5 has formed in both side of the interface. The diffusion of iron and aluminum atoms is companied with the Fe-Al reaction during
the treatment under the both conditions. The diffusion coefficients of iron and aluminum and the activation energy were determined.
The mechanism of the intermetallics formation in the couples is also discussed. |
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| Keywords: | diffusion diffusion couple Fe Al alloy intermetallics Fe Al reactive sintering |
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