Abstract
The phase separation in iron-rich Fe-Si-Ge ternary alloys was investigated by means of transmission electron microscopy. The phase separations into A2 and D03 were recognized in several alloys in addition to the phase separation into B2 and D03 which has already been found in Fe-Si and Fe-Ge binary systems. On the basis of TEM observations, isothermal section diagrams are proposed for the iron-rich corner at 823, 873, 923 and 973 K. The A2 + D03 two-phase field exists in a band-shaped region at 823 K. With increase in temperature,the A2 + D03 field gradually shrinks and is eventually replaced at 973 Kwith the B2 + D03 field, which extends from both the Fe-Si and Fe-Ge binary sides. The phase diagrams were well reproduced by the calculations based on the so-called Bragg-Williams-Gorsky approximation, taking account of the chemical and magnetic pair interactions up to the second nearest neighbour. The effects of the magnetism on the equilibria are discussed.
Similar content being viewed by others
References
G. Schlatte and G. Inden, Z. Metallkde 66 (1975) 660.
H. Warlimont, ibid. 59 (1968) 595.
G. Inden and W. Pitsch, ibid. 63 (1972) 253.
Idem, ibid. 62 (1971) 627.
H. Enoki, K. Ishida and T. Nishizawa, Metal. Trans. 18A (1987) 949.
P.Z. Zhao, T. Kozakai and T. Miyazaki, J. Jpn Inst. Met. 54 (1990) 1056 (in Japanese).
T. Kozakai and T. Miyazaki, in “Proceedings of 1st Japanese International SAMPE Symposium on New Materials and Processes for the Future”, (Yokohama 1989) p.139.
T. Kozakai and T. Miyazaki, in “Computer Aided Innovation of New Materials II”, edited by M. Doyama et al., (North-Holland, Amsterdam, 1993) p.767.
M. Fukaya, T. Kozakai and T. Miyazaki, J. Jpn Inst. Met. 52 (1988) 369 (in Japanese).
P.Z. Zhao, T. Kozakai and T. Miyazaki, ibid. 54 (1990) 139 (in Japanese).
T. Miyazaki, T. Kozakai and T. Tsuzuki, J. Mater. Sci. 21 (1986) 2557.
M. Fukaya, T. Miyazaki, P.Z. Zhao and T. Kozakai, ibid. 24 (1990) 522.
T. Kozakai and T. Miyazaki, ISI J. Int. 34 (1994) 373.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kozakai, T., Miyazaki, T. Experimental and theoretical phase diagrams of the iron-rich Fe-Si-Ge ordering system. JOURNAL OF MATERIALS SCIENCE 30, 5056–5064 (1995). https://doi.org/10.1007/BF00356049
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00356049