Abstract
The influence of a small addition of 0.5 wt.% aluminum nitride nanoparticles with an average size of 80 nm on the mechanical properties of a cast magnesium alloy under quasi-static tensile (strain rate 10−4 s−1) and plate impact loading (strain rate 105 s−1) was investigated. The composites were obtained by casting with a special mixing vortex device. After casting, some samples were subjected to heat treatment. The introduction of a small number of particles into the liquid metal led to a decrease in matrix grain size and a change in elasto-plastic and strength properties. Compared to quasi-static loading, the pre-heat treatment of tested alloys does not significantly affect the dynamic properties of a reinforced magnesium alloy under shock compression.
Highlights
Increased requirements for the mechanical, weight, operational, and other parameters of materials for the aviation, aerospace, military, and other industries in which weight reduction is important require the development of new technological solutions to improve the strength properties of materials
The aim of this study is to investigate the effect of small additions of aluminum nitride nanoparticles with an average size of 80 nm and a volume fraction of 0.5 wt.%—obtained by casting with a special mixing vortex device—on the mechanical properties
It was shown that the alloy structure in the as-cast condition and without the heat treatment is represented by coarse grains of the solid solution
Summary
Increased requirements for the mechanical, weight, operational, and other parameters of materials for the aviation, aerospace, military, and other industries in which weight reduction is important require the development of new technological solutions to improve the strength properties of materials. 0.75 wt.% and 1.5 wt.% AlN nanoparticles (with a size of 100 nm) in the cast magnesium alloy ML12 [6]. The device allows for the forming of a homogeneous structure with a reduced matrix grain size from 450 to 230 and 120 μm, respectively. Further improvements in structural parameters, including mechanical properties, can be ob55tained by heat treatments [7,8]. It was shown in [7] that the aging effect on the hardness of composites El21-AlN is significantly less compared with such an effect on the hardness of the initial alloy El21. AlN nanoparticles allow for the increasing of the heat and electrical conductivity of magnesium alloys [9]. The effect of heat treatment T6 on the improvement of mechanical properties of composites AZ91D/SiC is shown in [8]
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