Physico-Mechanical and Electrical Properties of Aluminum-Based Composite Materials with Carbon Nanoparticles

Abstract

Nanocomposite materials with the matrix of an A356 alloy reinforced with 0.2 and 1 wt% of high-elastic nanodiamonds were produced by ultrasonic dispersion of nanoparticles in the melt followed by casting in a metallic mold. The structure as well as the physical and mechanical properties of the cast samples were examined using optical and scanning electron microscopy, hardness and tensile testing. It is shown that the hardness, Young's modulus and electrical resistivity increase with introduction of nanodiamond particles.

Modeling the Break-up of Nano-particle Clusters in Aluminum- and Magnesium-Based Metal Matrix Nano-composites

“…It is known from various sources that ultrasound has a beneficial effect on deagglomeration of the nano-particle clusters [2][3][4][5][6]. This is explained by the phenomenon of acoustic cavitation, which includes the formation, growth, pulsation and collapse of gas bubbles.…”

“…Recent papers showed a clear increase in aluminum Young's modulus (by up to 100%) and in hardness (by up to 50%) with the addition of carbon nanoparticles [2]. Another study indicated a slight enhancement in Brinell hardness of aluminum, magnesium and copper based MMNCs with Al2O3 and AlN nanoparticles [3].…”

“…Such fluid velocity values can be locally achieved as a result of the collapse of cavitation bubbles induced by ultrasonic field. Indeed, applying an electro-magnetic stirring in combination with ultrasonic vibrations was found beneficial for nano-particle dispersion in metal melt [2][3][4][5][6][7][8].…”

Coupling of Acoustic Cavitation with Dem-Based Particle Solvers for Modeling De-agglomeration of Particle Clusters in Liquid Metals

“…For aluminum melt, the dynamic viscosity l f = 0.0013 Pa s. Assuming the interfacial energy c sl = 0.2 to 2.0 J/m 2 , Eq. [1] yields v f =100 to 1000 m/s. Such fluid velocity values can be locally achieved instantaneously as a result of the collapse of cavitation bubbles induced by the ultrasonic field.…”

“…Indeed, applying electromagnetic induction stirring in combination with ultrasonic vibrations was found beneficial for nanoparticle dispersion in metal melts. [1,12] To improve the understanding of how this process works from the modeling point of view, the cavitation process is first examined. In the following section, a high-order acoustic model is presented, coupled with a model of cavitation.…”