Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 10, Pages 3154-3164Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0376
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Funding
- Creative Research Group of National Natural Science Foundation of China [50721003]
- National Natural Science Foundation of China [50831007]
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The constitution of the ternary system Al-Cu-Fe in the region above 40 at.% Al at 600 degrees C is investigated by means of x-ray diffraction, metallography, scanning electron microanalysis with 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 + lambda Fe4Al13 <-> (Al) + omega at 600.7 degrees C and by the experimental findings that the phase alpha Fe4CuAl23 was not detected. A thermodynamic modeling of the Al-Cu-Fe system was then performed over the entire composition range by taking into account the phase diagram data above 560 degrees 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.
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