In this work, the Al-10Mg nanostructured alloy was synthesized by high-energy
mechanical milling. Subsequently, the powders consolidated under a uniaxial
pressing in the air. The as milled powders were analyzed using scanning
electron microscopy (SEM), transmission electron microscopy (TEM), X-ray
diffraction (XRD) and differential scanning calorimetry (DSC). SEM and XRD
also characterized the sintered samples. Vickers microhardness of sintered
Al-10Mg alloy was measured. SEM, XRD, and TEM characterizations show that
the Al-10Mg alloy was synthesized after 10 h milling. The X-ray powder
analysis of the structural parameters showed the increment with the time of
the lattice parameter, strain as well as the solubility of Mg in Al.
Besides, XRD and TEM studies showed that the crystallite size was reaching
an average value of 19 nm after 10 h milling. XRD patterns of the all
sintered specimens show the formation of the MgAl2O4 spinel phase. After
powders compaction, the specimen sintered at 420?C for 2 h shows
microhardness of 125 HV.
In this work, the multi-walled carbon nanotubes (MWCNTs) were purified with
an acid treatment and subsequently dispersed using ultrasound and a nonionic
surfactant solution of ethoxylated lauric alcohol 7 moles of ethylene oxide
(E7E). Then, carbon nanotubes (CNTs) were used as a reinforcement phase (0.4
wt.% and 0.8 wt.%) in the Al- 10Mg alloy. The high-energy ball milling was
employed for the nanocomposites processing, and the resulting powders
consolidate by uniaxial pressure. Measurements of Vickers microhardness,
nanohardness, displacement, and Young's modulus were carried out on the
compacts. The samples were analyzed using scanning electron microscopy
(SEM), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis),
Fourier-transform infrared spectroscopy (FT-IR), and Raman spectroscopy
(RS). Good dispersion of MWCNTs was achieved using 0.5 mg/ml of the E7E
surfactant. The CNTs were dispersed in the Al-10Mg matrix using 0.25 h of
milling. After powders compaction, the Al-10Mg/0.4MWCNTs nanocomposite
presented a microhardness of 190 HV, nanohardness of 3.5 GPa, and Young's
modulus 116 GPa.
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