Icosahedral phase in rapidly solidified Al–Fe–Ce alloy

To study the mechanisms for the high strength of Al–TM–Re alloys, we synthesized metallic glasses Al 90Cu 5Ce 5 and Al 90Fe 5Ce 5 by melt spinning. Icosahedral particles surrounded by f.c.c.-Al were found to appear as a primary precipitation phase in the amorphous Al 90Fe 5Ce 5 alloy. The mechanical...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2002-01, Vol.323 (1), p.226-231
Main Authors: Zhang, Chuanjiang, Wu, Youshi, Cai, Xueling, Zhao, Fang, Zheng, Shuqi, Zhou, Guorong, Wu, Si
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Glass formability
Icosahedral structural units
Materials science
Metallic glass
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Pre-peak
Solidification
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Summary:To study the mechanisms for the high strength of Al–TM–Re alloys, we synthesized metallic glasses Al 90Cu 5Ce 5 and Al 90Fe 5Ce 5 by melt spinning. Icosahedral particles surrounded by f.c.c.-Al were found to appear as a primary precipitation phase in the amorphous Al 90Fe 5Ce 5 alloy. The mechanical properties of the amorphous Al 90Fe 5Ce 5 alloy can be enhanced by using a mixed structure of icosahedral nanoparticles, Al nanoparticles and amorphous matrix. Microstructure analysis suggests that icosahedral structural units are homogeneously distributed in the matrix of the amorphous Al 90Fe 5Ce 5 alloy. These structural units can be identified by the characteristic isothermal calorimetric signals associated with their transformation to fine quasicrystalline grains. The unusual glass formability of the Al–Fe–Ce alloy is discussed in this report. A distinct pre-peak is observed in the X-ray diffraction patterns of the amorphous Al 90Cu 5Ce 5 and the Al 90Fe 5Ce 5 alloys. The relaxation and glass transition phenomena are clearly observed for the Al 90Cu 5Ce 5 alloy. Based on the structure difference between Al 90Fe 5Ce 5 and Al 90Cu 5Ce 5, the origin of the pre-peak can be attributed to the inter-metallic compounds pre-existent in the amorphous matrix.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(01)01353-3