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Experimental investigation and thermodynamic modeling of the ternary Al–Cu–Fe system

Published online by Cambridge University Press:  31 January 2011

Hai-Lin Chen ,
Yong Du ,
Honghui Xu  and
Wei Xiong
Yong Du*
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
Wei Xiong
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The constitution of the ternary system Al–Cu–Fe in the region above 40 at.% Al at 600 °C is investigated by means of x-ray diffraction, metallography, scanning electron microanalysis, energy dispersive x-ray spectroscopy, and differential thermal analysis. The phase equilibria in the Al-rich corner are clarified by the valuable experimental evidence for the four-phase reaction L + λFe4Al13 ↔ (Al) + ω at 600.7 °C and experimental findings that the phase αFe4CuAl23 was not detected. A thermodynamic model of the Al–Cu–Fe system was then performed over the entire composition range by taking into account the phase diagram data above 560 °C from the literature and the present work. This work challenged the modeling of the considerably complex order–disorder phase transition between bcc_A2 and bcc_B2 phases and the miscibility gap of bcc_B2 phase using the modified sublattice model.

Keywords

Phase equilibriaScanning electron microscopy (SEM)X-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 10 , October 2009 , pp. 3154 - 3164
Copyright
Copyright © Materials Research Society 2009

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