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Abstract
In this research project, Al matrix composite materials reinforced with 5 and 10 (wt.%) of FeAl intermetallic particles were synthesized by Mechanical Alloying (MA) at a speed of 250 RPM for 2, 5, 10 and 15 h of milling time. The results showed that composite materials can be obtained at low energy conditions with improved dispersion of the reinforcement in the Al matrix compared to those obtained by conventional techniques. The composites powders obtained by mechanical alloying at different milling times were studied by Scanning Electron Microscopy (SEM) in order to characterize the morphology and particle size. X-Ray Diffraction (XRD) was used to study the structural evolution of the system as the initial powders were subjected to different milling times, thus obtaining the evolution of the present phases, changes in lattice parameters and crystallite size. This work demonstrates the viability of the MA technique to produce composite materials with a homogenous distribution of the reinforcement particles with a great degree of control in the process, which would be very difficult to reproduce by conventional synthesis methods.
Highlights
Aluminum is one of the most used materials in today's industry due to its low weight, malleability and corrosion resistance (Khakbiz and Akhlaghi, 2009), it is one of the most abundant materials available in nature
Mechanical Alloying (MA) is a unique solid state reaction process that develops between the surface of the powders at room temperature, it can be used to synthesize alloys impossible or difficult to obtain by conventional methods, all this due to its uniqueness to process new materials
The micrograph of the mixture of Al-5%FeAl powders after 2 h of milling (Fig. 2a) shows two types of deformation mechanisms typical of mechanical alloying; ductile deformation, which forms flatter and elongated particles, characteristic of the deformation that the Al powders experience during the first hours of milling and brittle deformation, which gives rise to the formation of particles with more angular and irregular morphology, which is typical of brittle materials such as intermetallic composites, ductile deformation has been reported by (Abdoli et al, 2008), to be the primary deformation mechanism responsible for the formation of larger particles during the MA process
Summary
Aluminum is one of the most used materials in today's industry due to its low weight, malleability and corrosion resistance (Khakbiz and Akhlaghi, 2009), it is one of the most abundant materials available in nature. Mechanical Alloying (MA) is a unique solid state reaction process that develops between the surface of the powders at room temperature, it can be used to synthesize alloys impossible or difficult to obtain by conventional methods, all this due to its uniqueness to process new materials. With respect to composite materials, the mechanical alloying technique is capable of producing powders with a superior homogeneity compared to other methods (Suryanarayana et al, 2001). The mechanical alloying process consists in a mixture of powders placed in a container and subjected to highenergy collisions by the balls over a period of time to reach conditions where welding and fracture events become stable, another of the attributes of the MA technique is that it allows the extension of solubility limits of the alloys, achieving supersaturated solid solutions with improved mechanical properties
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