期刊
ACTA MATERIALIA
卷 58, 期 5, 页码 1732-1740出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.11.015
关键词
High-resolution electron microscopy (HREM); Electron energy loss spectroscopy (EELS); Transmission electron microscopy (TEM); Particulate reinforced composites; Metal matrix composites (MMC)
资金
- U.S. Army Research Laboratory (ARL)
- [W911NF-08-2-0028]
The presence of aluminum nitride in nanostructured aluminum metal matrix composites was studied by high resolution transmission electron microscopy, electron energy loss spectroscopy, energy dispersive X-ray spectroscopy analysis and electron microscopy simulations. Three types of aluminum nitride structures were identified; predominantly, one layer of N atoms occupies the tetrahedral interstitial positions in the Al lattice, the frequency of which varies as a function of spatial location. The second and third were in the form of hexagonal and possibly cubic aluminum nitride particles with particle sizes on the order of 15-20 nm. The results suggest that the aluminum nitride phase evolves from intermediate transitional structures that involve N atoms in the Al lattice. The aluminum nitride phases frequently contained O and Mg, which preferentially segregate in close proximity to the reinforcement particles. First-principle calculations were used to describe the influence of O and Mg on the adsorption of N. (c) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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