Magnesium and its alloys are promising materials for automotive, aerospace and bio-implant applications due to low density (1.81g/cm3), very low elastic modulus (45GPa) and high tensile yield strength (200MPa). However, they corrode too quickly in aggressive environments and possess poor wear resistance. Wear and corrosion are essentially surface dependent degradation which may be improved by suitable modification of surface microstructure and composition. Laser as a source of coherent and monochromatic radiation may be applied for tailoring the surface microstructure and composition. In the present contribution, a detailed overview of laser surface engineering of magnesium-based alloys is presented. Finally, the future scope of application of laser surface engineering of magnesium-based alloys is presented with examples.
This chapter reports the detailed study on the synthesis of nanofluids comprising very low concentrations of nanometric metallic or ceramic particles, rods, tubes, etc. The most common ways of preparing nanofluids are the one-step and two-step methods. While the one-step approach usually yields more stable nanofluids, the two-step method is more versatile as it provides the opportunity to disperse a wide variety of nanoparticles in different types of base fluids. However, the main focus of this chapter is on the thermal conductivity of nanofluids, which is the most researched aspect of nanofluids worldwide. An insight into the different parameters that influence the thermal conductivity of nanofluids is presented. In addition to experimental work, the theories used to try to analyze the cause of the anomalous increase in thermal conductivity are also presented.
Fluids with suspended nanoparticles (metallic or ceramic in spherical or non-spherical shapes), forming a stable colloid and maintaining a quasi-single-phase state that can offer an extraordinary level of heat transport property at very low levels of dispersion (
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