期刊
ACTA MATERIALIA
卷 129, 期 -, 页码 290-299出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.02.060
关键词
Intermetallic compound; Phase diagram; Orientation variant; Scanning transmission electron microscopy; ab-initio total energy calculations
资金
- JSPS KAKENHI [15H02300, 16K14415, 16H04516, 16K14373]
- Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Advanced Low Carbon Technology Research and Development Program (ALCA) from the Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [16K14415, 16K14373, 15H02300, 16H04516] Funding Source: KAKEN
The low-temperature phase of eta-Fe2Al5 has been identified experimentally for the first time and the crystal structure of the low-temperature phase (designated as eta') has been refined by scanning transmission electron microscopy, combined with first-principles calculations. The low-temperature eta' phase has a tripled superlattice structure based on the orthorhombic eta-Fe2Al5 (space group Cmcm), in which Al atoms occupy two ninths of the partially occupied Al sites (Al2 and Al3) in a chain along the c-axis of the orthorhombic parent lattice in an ordered manner, giving rise to the monoclinic space group C2/c, the stoichiometric composition Fe3Al8 (Al-27.3 at%Fe), and the Pearson symbol mC44. The partially occupied Al sites along the c-axis of the orthorhombic parent lattice are converted to the Al site (Al3 site) of full occupancy in the monoclinic superlattice of the eta'-Fe3Al8. The eta-eta'phase transformation temperature decreases from between 350 and 400 degrees C at the composition of Al-26.7 at.%Fe to between 300 and 350 degrees C at compositions in the range of Al-27.3 to 28.6 at.%Fe, indicating that the eta' phase exists primarily at the Fe-lean side of the solid-solubility region of the eta-Fe2Al5 phase. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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