Phase stability of Fe{sub 3}Al with addition of 3d transition elements
- Nagoya Inst. of Tech., Showa, Nagoya (Japan). Dept. of Materials Science and Engineering
In Fe{sub 3}Al with the D0{approximately}3 structure, there are two non-equivalent Fe sites with specific neighbor configurations, which are named an Fe{sub I} and an Fe{sub II} site. The former has eight Fe nearest neighbors in an octahedral configuration, and the latter has four Fe and four Al nearest neighbors in a tetrahedral configuration. It is known in Fe{sub 3}Si, which is isomorphous with Fe{sub 3}Al that 3d transition-metal impurities substitute for the Fe{sub I} or the Fe{sub II} site selectively: thus in the (Fe{sub 1{minus}x}M{sub x}){sub 3}Si system, the elements to the left of Fe in the periodic table, i.e., M = Ti, V, Cr and Mn, show a strong preference for the Fe{sub I} site, whereas those to the right, such as M = Co and Ni, occupy the Fe{sub II} site. It appears that the site preference of 3d transition elements in Fe{sub 3}Al follows closely that of Fe{sub 3}Si and Fe{sub 3}Ga, as supported by energy-band calculations. In Fe{sub 3}Al, however, the site preference data are still incomplete: Moessbauer experiments for the substitution of V and Cr provide tentative exceptions to the above trend, while Ti and probably Mn occupy the Fe{sub I} site. In the present study, the authors have employed Fe{sub 3}Al as a base material and investigated the stability of the D0{sub 3} structure relative to the B2 structure for the pseudobinary alloys (Fe{sub 1{minus}x} M{sub x}){sub 3}Al with 3d transition elements.
- OSTI ID:
- 438630
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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