HRTEM and EELS study of aluminum nitride in nanostructured Al 5083/B4C processed via cryomilling
✍ Scribed by Y. Li; W. Liu; V. Ortalan; W.F. Li; Z. Zhang; R. Vogt; N.D. Browning; E.J. Lavernia; J.M. Schoenung
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 934 KB
- Volume
- 58
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
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.