TY - JOUR
T1 - Phase equilibria and stability of ordered BCC phases in the Fe-rich portion of the Fe-Al system
AU - Ikeda, O.
AU - Ohnuma, Ikuo
AU - Kainuma, R.
AU - Ishida, K.
N1 - Funding Information:
The authors wish to thank Mr. A. Shimo for his help in carrying out the experiments. This work was supported by the Grant in-aid for Scientific Research from the Ministry of Education, Science and Culture, Japan. One of the authors (R.K.) would like to thank Kawasaki Steel 21st Century Foundation for its support.
PY - 2001/9
Y1 - 2001/9
N2 - Phase stability of the BCC phases with A2, B2 and D03 structures and phase equilibria among these phases in the Fe-rich portion of the Fe-Al binary system were examined using diffusion couples, transmission electron microscopy (TEM), energy dispersion spectroscopy (EDS) and Vickers hardness (VH) measurement. TEM observations of the diffusion couples annealed at the temperatures between 300 and 700 °C were performed to identify the crystal structure of the ordered phases and to measure the average size of the B2 and D03 ordered domains. Phase boundaries between A2 and B2 or D03 phases were then evaluated by comparison between the concentration profile and the profiles of the ordered phase domain size or Vickers hardness. It was clarified that the present results in the high temperature range over 450 °C are in agreement with the previous data, while the A2+D03 two-phase field extends beyond the A2/D03 phase boundary in the currently available phase diagram into a lower Al range at temperatures below 450 °C. The A2→B2, B2→D03 and para→ferro continuous ordering temperatures were also measured by differential scanning calorimetry (DSC).
AB - Phase stability of the BCC phases with A2, B2 and D03 structures and phase equilibria among these phases in the Fe-rich portion of the Fe-Al binary system were examined using diffusion couples, transmission electron microscopy (TEM), energy dispersion spectroscopy (EDS) and Vickers hardness (VH) measurement. TEM observations of the diffusion couples annealed at the temperatures between 300 and 700 °C were performed to identify the crystal structure of the ordered phases and to measure the average size of the B2 and D03 ordered domains. Phase boundaries between A2 and B2 or D03 phases were then evaluated by comparison between the concentration profile and the profiles of the ordered phase domain size or Vickers hardness. It was clarified that the present results in the high temperature range over 450 °C are in agreement with the previous data, while the A2+D03 two-phase field extends beyond the A2/D03 phase boundary in the currently available phase diagram into a lower Al range at temperatures below 450 °C. The A2→B2, B2→D03 and para→ferro continuous ordering temperatures were also measured by differential scanning calorimetry (DSC).
KW - A. iron aluminides (based on FeAl)
KW - A. iron aluminides (based on FeAl)
KW - B. order/disorder transformations
KW - B. phase diagram
KW - F. electron microscopy, transmission
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U2 - 10.1016/S0966-9795(01)00058-9
DO - 10.1016/S0966-9795(01)00058-9
M3 - Article
AN - SCOPUS:0035441878
SN - 0966-9795
VL - 9
SP - 755
EP - 761
JO - Intermetallics
JF - Intermetallics
IS - 9
ER -