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Title: Characterization of Al and Fe nanosized powders synthesized by high energy mechanical milling

Abstract

The process of nanocrystalline structure formation during mechanical milling was studied in Al and Fe powders. A detailed microstructural study of powder samples was carried out by X-ray diffraction experiments as a function of milling time. As a result, nanosized powders have been synthesized with microstructures showing a significant decrease of the coherent diffraction domains and the creation of a large number of linear defects, which induce microstrains. SEM results show that welding of very small particles to the surfaces of larger particles occurred and that the powder particles tended to form a matrix of randomly welded thin layers of highly deformed particles. Calorimetric measurements, as a function of milling time, indicated the decrease of the melting point of Al powder and at early stages it can be seen that initially endothermic peak was divided to two endothermic melting peaks. This is probably due to the oxide layer around the Al grains. In the case of Fe powder, the DSC measurements show a broad exothermal peak occurring over quite a large temperature interval, corresponding to the strain release and grain growth.

Authors:
 [1];  [1]; ;  [1]
  1. Laboratoire de Metallurgie Appliquee, Faculte des Sciences de Sfax, B. P. 802, 3018-Sfax (Tunisia)
Publication Date:
OSTI Identifier:
21140748
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 59; Journal Issue: 7; Other Information: DOI: 10.1016/j.matchar.2007.08.001; PII: S1044-5803(07)00268-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; CALORIMETRY; COMMINUTION; CRYSTALS; DEFECTS; GRAIN GROWTH; IRON; LAYERS; MATRICES; MELTING; MELTING POINTS; MICROSTRUCTURE; NANOSTRUCTURES; OXIDES; PARTICLES; POWDERS; SCANNING ELECTRON MICROSCOPY; STRAINS; THIN FILMS; WELDING; X-RAY DIFFRACTION

Citation Formats

Mhadhbi, Mohsen, Khitouni, Mohamed, Azabou, Myriam, and Kolsi, Abdelwaheb. Characterization of Al and Fe nanosized powders synthesized by high energy mechanical milling. United States: N. p., 2008. Web. doi:10.1016/j.matchar.2007.08.001.
Mhadhbi, Mohsen, Khitouni, Mohamed, Azabou, Myriam, & Kolsi, Abdelwaheb. Characterization of Al and Fe nanosized powders synthesized by high energy mechanical milling. United States. https://doi.org/10.1016/j.matchar.2007.08.001
Mhadhbi, Mohsen, Khitouni, Mohamed, Azabou, Myriam, and Kolsi, Abdelwaheb. 2008. "Characterization of Al and Fe nanosized powders synthesized by high energy mechanical milling". United States. https://doi.org/10.1016/j.matchar.2007.08.001.
@article{osti_21140748,
title = {Characterization of Al and Fe nanosized powders synthesized by high energy mechanical milling},
author = {Mhadhbi, Mohsen and Khitouni, Mohamed and Azabou, Myriam and Kolsi, Abdelwaheb},
abstractNote = {The process of nanocrystalline structure formation during mechanical milling was studied in Al and Fe powders. A detailed microstructural study of powder samples was carried out by X-ray diffraction experiments as a function of milling time. As a result, nanosized powders have been synthesized with microstructures showing a significant decrease of the coherent diffraction domains and the creation of a large number of linear defects, which induce microstrains. SEM results show that welding of very small particles to the surfaces of larger particles occurred and that the powder particles tended to form a matrix of randomly welded thin layers of highly deformed particles. Calorimetric measurements, as a function of milling time, indicated the decrease of the melting point of Al powder and at early stages it can be seen that initially endothermic peak was divided to two endothermic melting peaks. This is probably due to the oxide layer around the Al grains. In the case of Fe powder, the DSC measurements show a broad exothermal peak occurring over quite a large temperature interval, corresponding to the strain release and grain growth.},
doi = {10.1016/j.matchar.2007.08.001},
url = {https://www.osti.gov/biblio/21140748}, journal = {Materials Characterization},
issn = {1044-5803},
number = 7,
volume = 59,
place = {United States},
year = {Tue Jul 15 00:00:00 EDT 2008},
month = {Tue Jul 15 00:00:00 EDT 2008}
}