In this work, a composite material of nanostructured Al based matrix and reinforced with TiC was prepared by two variants of milling: mechanical alloying and ball milling. During the mechanical alloying, a solid solution of Copper dissolved in Aluminum matrix (Al-α) was prepared from a stoichiometric mixture of high purity powders of Cu and Al. In the course of the ball milling stage, the powder mixture composed by the TiC phase was mixed with the solid solution (Al-α). This mixture was mechanically milled under conditions of low energy. In accordance with the X-ray diffraction analysis, a solid solution of Cu in Al was produced at the tenth hour of milling. The crystallite size pertaining to the solid solution of Cu in Al (α-Al), decreased from 55 to 33 nm as the milling time elapsed from 2.5 to 20 h. During the mechanical milling stage, the powder mixture composed by the solid solution Al-a together with TiC phase did not undergo a mechanochemical reaction that could give place to the formation of second phases. Besides, during ball milling process, an additional reduction of crystallite size of Al-α phase was revealed, this behavior is because ceramic TiC particles acted as milling media. Besides, Mathematical descriptive models were fitted to the variation of the microstructural features as a function of processing time. Such microstructural characteristics are: particle size, crystallite size, lattice parameter and dislocation density.
|Number of pages
|Digest Journal of Nanomaterials and Biostructures
|Published - 1 Apr 2017
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© 2017, Inst Materials Physics. All rights reserved.
- Al alloy
- Mechanical alloying
- Mechanical milling
- Nanostructured alloy
- Solid solution