Abstract
In this work, magnesium-based composites were obtained by shock-wave compaction of a powder mixture of Mg-5 wt.% AlN at a shock-wave pressure of 2 GPa. Their microstructure was investigated and the phase composition was determined, from which it follows that the nanoparticles retain their phase composition and are uniformly distributed in the magnesium matrix. The materials obtained by shock-wave compaction were used as master alloys for the production of magnesium alloys by die casting. The amount of aluminum nitride nanoparticles in the AZ91 magnesium alloy was 0.5 wt.%. Studies of the microstructure of the magnesium alloys showed a decrease in the average grain size of the magnesium matrix from 610 to 420 μm. Studies of mechanical properties have shown that the introduction of aluminum nitride nanoparticles increases the yield strength from 55 to 119 MPa, the tensile strength from 122 to 171 MPa and the plasticity from 4 to 6.5%, respectively. The effect of nanoparticles on the fracture behavior of the magnesium alloy under tension was determined.
Highlights
Light metal matrix composites (LMMCs) reinforced with dispersed particles have been actively studied in recent years as a new class of materials, with the aim of their possible application in mechanical engineering, aviation and other industries
The microstructure and properties of the AZ91 magnesium alloy reinforced with aluminum nitride nanoparticles were investigated
It was found that the introduction of AlN nanoparticles leads to an insignificant increase in the porosity of the magnesium alloy from 5 to 7% and has a modifying effect on the microstructure, reducing the average grain size of the alloy from 490 to 310 μm
Summary
Light metal matrix composites (LMMCs) reinforced with dispersed particles have been actively studied in recent years as a new class of materials, with the aim of their possible application in mechanical engineering, aviation and other industries. Interest in such materials has arisen due to the unique combination of properties: high specific stiffness and strength, fracture toughness, electrical and thermal conductivity, wear resistance, hardness, durability, etc. It is possible to use such metals as aluminum, magnesium, titanium, nickel and their alloys. The chemical composition of such alloys is usually the following composition of elements: Mg—89.1–92.15%, Fe—up to 0.06%, Si—up to 0.25%, Mn—0.15–0.5%, Ni—up to 0.01%, Al—7.5–9%, Cu—up to 0.1%, Zr—up to
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