An experimental and modeling investigation of aluminum-based alloys and nanocomposites processed by ultrasonic cavitation processing

Simulation of Ultrasonic Induced Cavitation and Acoustic Streaming in Liquid and Solidifying Aluminum

“…The following energy release leads to shock waves and temperature peaks in the area near the collapsing bubbles [1,6,7]. These effects lead to grain refinement of aluminum primarily via (1) wetting of nonsoluble and nonmetallic particles in the melt (e.g., Al 2 O 3 ) [8][9][10][11], (2) nucleation of aluminum grains caused by the collapse accompanying shock waves [11][12][13][14][15], (3) dendrite fragmentation [1,9,[16][17][18][19][20], and (4) de-agglomeration [1,21]. In addition, UST can be used for melt degassing to further increase the density index and improve both the melt and final casting quality.…”

Advanced Metal Matrix Nanocomposites

“…As a result, mechanical properties of the metal matrix nanocomposite are enhanced [8,21]. In the nanocomposites processed by ultrasonic melt treatment, metal matrices are largely focused on aluminum [116,117,[123][124][125][126][127][128], magnesium alloys [6,[129][130][131], and transition metal alloys [8]. Typical nanoparticle reinforcers [8,[132][133][134] include SiC, Al 2 O 3 , and various carbon polymorphs (e.g., graphene, carbon nanotubes, and diamond nanoparticles).…”

“…For example, CFD coupled with the dense discrete phase model (DDPM) was applied to simulate the dynamic process of nanoparticles injection into the cavitation region in the molten metals. In a simulation of injecting SiC or Al 2 O 3 nanoparticles (up to 1.0 wt%) into the molten A356 aluminum alloy, the nanoparticles are distributed well in the fluid after 3 s of ultrasonic melt treatment [124,144]. Obviously, the intense flow convection induced by the ultrasonic cavitation plays an important role in the deagglomeration and dispersion of ceramic nanoparticles in molten metals [143,144].…”

Hollow MgNi1.4Zn0.6/CaCu2.79Fe4.21O12 nanocomposite synthesis via ultrasonic high‐temperature spray pyrolysis

“…Generally, nanocomposites were mainly of different groups: (i) polymer nanocomposites, (ii) ceramics, and (iii) metal‐added nanocomposite. The metal nanocomposites are mostly composed of metal and its alloy, and used in industries and automobiles due to its enhanced mechanical strength …”

“…The metal nanocomposites are mostly composed of metal and its alloy, and used in industries and automobiles due to its enhanced mechanical strength. 5 In general, various methods are available for the synthesis of metal and metal-based nanocomposites, such as sol gel method, 6 ultrasonication, 7 and spray pyrolysis. 8 Even though different synthesis methods are available for bulk production with less impurity, spray pyrolysis is recommended as the most excellent method for the synthesis of nanocomposites, because it does not require any capping, or reducing agent.…”