Abstract
We report on the fabrication of fractal dendrites using laser-induced melting of aluminum alloys. We target boron carbide (BC), which is one of the most effective radiation-absorbing materials characterized by a low coefficient of thermal expansion. Due to the high fragility of BC crystals, we were able to introduce its nanoparticles into a stabilization aluminum matrix of AA385.0. The high-intensity laser field action led to the formation of composite dendrite structures under the effect of local surface melting. Modelling the dendrite cluster growth confirms its fractal nature and sheds light on the pattern behavior of the resulting quasicrystal structure.
Highlights
We show that a high-energy pulse regime of laser action with an energy of up to 5 J per pulse induces the formation of two types of fractal clusters evolving during the crystallization process
We observed two types of a clusters grow on an Aluminum alloys (AAs) surface under different regimes of laser processing
Under the effect of melted matter of a aluminum matrix composite target, the dendrite clusters framed with Boron carbide (B4 C) microcubes formed
Summary
High-strength aluminum alloys are significantly superior to low-carbon and low-alloy steels as well as pure titanium in terms of strength-to-density and yield-to-density ratios. According to these criteria, they approach steel alloys of higher strength and titanium alloys [1]. Despite the fact that laser processing opens up various possibilities to locally modify metal surface properties [5,6], aluminum and its alloys are hardly sensitive to a laser field due to the combination of high values of reflectivity, thermal conductivity, and heat capacity [7]. This microporosity is of gas and shrinkage nature [8], which is characteristic for casting of aluminum in general
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