Simultaneous effects of strain rate and temperature on mechanical response of fabricated Mg–SiC nanocomposite

Abstract

Mg–SiC nanocomposite samples were fabricated using split Hopkinson pressure bar for different SiC volume fractions and under different temperature conditions. The microstructures and mechanical properties of the samples including microhardness and stress–strain curves were captured from quasi-static and dynamic tests carried out using Instron and split Hopkinson pressure bar, respectively. Nanocomposites were produced by hot and high-rate compaction method using split Hopkinson pressure bar. Temperature also significantly affects relative density and can lead to 2.5% increase in density. Adding SiC-reinforcing particles to samples increased their Vickers microhardness from 46 VH to 68 VH (45% increase) depending on the compaction temperature. X-ray diffraction analysis showed that by increasing temperature from 25℃ to 450℃, the Mg crystallite size increases from 37 nm to 72 nm and decreases the lattice strain from 45% to 30%. In quasi-static tests, the ultimate compressive strength for the compaction temperature of 450℃ was improved from 123% for Mg–0 vol.% SiC to 200% for the Mg–10 vol.% SiC samples compared with those of the compaction at room temperature. In dynamic tests, the ultimate strength for Mg–10 vol.% SiC sample compacted at high strain rate increased remarkably by 110% compared with that for Mg–0 vol.% SiC sample compacted at low strain rate.

Effect of Multi-Walled Carbon Nanotubes and Carbon Fiber Reinforcements on the Mechanical and Tribological Behavior of Hybrid Mg-AZ91D Nanocomposites

“…The Mg AZ91D composite contains 0.75 wt.% CF and 0.75 wt.% MWCNT reinforcements, showing the highest UTS (23% and 51% higher) and YS (22% and 47% higher) compared to the Mg AZ91D composite containing 0.5 wt.% CF and 0.5 wt.% MWCNT, and Mg AZ91D, respectively. Similar behavior was also observed by the authors in the work on Mg composites [ 5 , 6 ]. Similarly, the percentage of elongation of the Mg AZ91D composite containing 0.75 wt.% CF and 0.75 wt.% MWCNT reinforcements show lower percentages (22% and 30% lower) compared to the Mg AZ91D composite containing 0.5 wt.% CF and 0.5 wt.% MWCNT, and Mg AZ91D.…”

“…They have a diameter of fewer than 100 nanometers and can be as thin as 1 or 2 nm. Researchers are exploring their utilization in various applications, such as materials science, electronics, chemical processing, energy management, and other fields [ 6 , 7 ]. Carbon fibers (also known as CF, or graphite fibers) are made primarily of carbon atoms and measure 5 to 10 μm (0.00020–0.00039 in) in diameter.…”

The effect of particle size on microstructure, relative density and indentation load of Mg-B4C composites fabricated at different loading rates

“…More details about the fabrication procedure and the preparations to prevent oxidation and agglomeration can be found in Rahmani et al. 20 Table 1 shows the milling conditions and properties of powders used in the experiments.…”

“…Mg powder (3.5 g) with a density of around 55% of theoretical density was used for compaction. More details about the fabrication procedure and the preparations to prevent oxidation and agglomeration can be found in Rahmani et al 20 Table 1 shows the milling conditions and properties of powders used in the experiments. Figure 2 shows the SEM images of a magnesium particle after mixing and milling with B 4 C reinforcement particles at different magnifications.…”