TY - JOUR
T1 - Phase equilibria and γ′-L12 phase stability in the Ni-rich portion of Ni-Fe-Si and Ni-Fe-Al systems
AU - Himuro, Y.
AU - Tanaka, Y.
AU - Ohnuma, I.
AU - Kainuma, R.
AU - Ishida, K.
N1 - Funding Information:
The authors wish to thank Mr S. Imano for help with the experimental work. This work was supported by Grant-in-Aids for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan. The support from CREST, Japan Science and Technology Agency, is also acknowledged.
PY - 2005/6
Y1 - 2005/6
N2 - Stable and metastable phase equiliblia among γ-FCC, γ′-L12 Ni3Si and δ-Ni 31Si12 phases in the Ni-Fe-Si system and among γ-FCC, γ′-L12 Ni3Al and β-B2 NiAl phases in the Ni-Fe-Al system were examined. The stable phase diagrams in the Ni-rich portion were determined by energy dispersion X-ray spectroscopy (EDX) and electron probe microanalysis (EPMA) using specimens fully annealed at temperatures in the interval 700-1300 °C. On the other hand, the γ/γ′ metastable phase equilibria were investigated by the electrical resistivity (ER) measurement technique, transmission electron microscopic (TEM) observation and TEM-EDX analysis. It was confirmed that the metastable γ′ phase coherently precipitates in the γ matrix due to aging even in the specimens with a high Fe composition over 60 at.%, and that both the γ′-Ni3Si or γ′-Ni3Al phase fields extend not only toward the Ni3Fe portion but also toward the Fe3Si or Fe3Al portion, forming metastable (Ni,Fe)3Si or (Ni,Fe)3Al intermetallic compound with the L12 structure.
AB - Stable and metastable phase equiliblia among γ-FCC, γ′-L12 Ni3Si and δ-Ni 31Si12 phases in the Ni-Fe-Si system and among γ-FCC, γ′-L12 Ni3Al and β-B2 NiAl phases in the Ni-Fe-Al system were examined. The stable phase diagrams in the Ni-rich portion were determined by energy dispersion X-ray spectroscopy (EDX) and electron probe microanalysis (EPMA) using specimens fully annealed at temperatures in the interval 700-1300 °C. On the other hand, the γ/γ′ metastable phase equilibria were investigated by the electrical resistivity (ER) measurement technique, transmission electron microscopic (TEM) observation and TEM-EDX analysis. It was confirmed that the metastable γ′ phase coherently precipitates in the γ matrix due to aging even in the specimens with a high Fe composition over 60 at.%, and that both the γ′-Ni3Si or γ′-Ni3Al phase fields extend not only toward the Ni3Fe portion but also toward the Fe3Si or Fe3Al portion, forming metastable (Ni,Fe)3Si or (Ni,Fe)3Al intermetallic compound with the L12 structure.
KW - A. Nickel aluminides, based on NiAl
KW - A. Silicides, various
KW - B. Phase diagrams
KW - B. Precipitates
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U2 - 10.1016/j.intermet.2004.10.009
DO - 10.1016/j.intermet.2004.10.009
M3 - Article
AN - SCOPUS:13844271268
SN - 0966-9795
VL - 13
SP - 620
EP - 630
JO - Intermetallics
JF - Intermetallics
IS - 6
ER -