Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

Modeling and Experimental Validation of Deagglomeration of Ultrafine Nanoparticles in Liquid Al During Noncontact Ultrasonic Casting of Al–Al2O3 Nanocomposite

“…Hence, during ultrasonification, high-intensity ultrasonic waves have been utilized for the deagglomeration of the nanoparticles and degassing of melt [2,4,10,14]. The principle behind this is the process of cavitation where in ultrasonic waves propagating in the liquid melt gives rise to nonlinear effects.…”

“…Such an implosive collapse of the bubbles results in the local rise of temperature close to 20000K [9], although for an extremely short duration. It also results in generation of high-pressure shock waves which travel in the liquid melt at speeds which are above the velocity of sound and helps in deagglomeration by breaking the Van der Waals forces [10][11][12][13][14][15]. Researchers have also reported that the pressure adjacent to the implosive collapse reaches close to 1000atm.…”

Processing, microstructural evolution and strength properties of in-situ magnesium matrix composites containing nano-sized polymer derived SiCNO particles

“…There exist several variants of in-situ processes. These include both liquid metallurgy, and solid state processing routes [5][6][7][8][9][10]. Bhingole [7] added magnesium nitrate as oxygen supplying agent into the molten Mg-alloy and synthesized in-situ AZ91 matrix composites by in-situ reactive formation of hard MgO and Al 2 O 3 particles.…”

“…These include both liquid metallurgy, and solid state processing routes [5][6][7][8][9][10]. Bhingole [7] added magnesium nitrate as oxygen supplying agent into the molten Mg-alloy and synthesized in-situ AZ91 matrix composites by in-situ reactive formation of hard MgO and Al 2 O 3 particles. Despite the fact that numerous in-situ MMC processing routes are reported in the literature [5][6][7][8][9][10], their reaction pathways and chemical kinetics are complex to understand.…”

Influence of bismuth on the microstructure, hardness and dry sliding wear behavior of magnesium silicide reinforced magnesium alloy composite

“…Magnesium metal matrix composites can be processed using both ex-situ and in-situ techniques. However, it has been noted that the in-situ method of processing results in improved grain structure, mechanical properties and wear properties for the final metal matrix composites [1,2]. Magnesium alloys containing Mg 2 Si particles seem to show high melting temperatures, low density, high hardness, low thermal expansion coefficients and reasonably high elastic moduli.…”