The paper addresses the production and investigation of the Mg–Ca–Zn alloy dispersion-hardened by diamond nanoparticles. Structural studies have shown that diamond nanoparticles have a modifying effect and make it possible to reduce the average grain size of the magnesium alloy. Reduction of the grain size and introduction of particles into the magnesium matrix increased the yield strength, tensile strength, and ductility of the magnesium alloy as compared to the original alloy after vibration and ultrasonic treatment. The magnesium alloy containing diamond nanoparticles showed the most uniform fracture due to a more uniform deformation of the alloy with particles, which simultaneously increased its strength and ductility.
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.
In this paper, the study of the effect of diamond nanoparticles on the structure and mechanical properties of the Mg-Ca-Zn magnesium alloy. The influence of diamond nanoparticles concentration amount of 0.1 wt. % in the structure of alloy Mg-Ca-Zn, the ultimate tensile strength increases from 294 up to 332 MPa, the elongation value increases from 22 % up to 27 % and the yield strength increases from 66 up to 75 MPa in the tested samples. Nanoparticles in magnesium alloy do not change the hardness of the alloy. The introduction of diamond nanoparticles into the magnesium alloy increased the Zn concentration from 4 % to 4.7 % and the Ca concentration from 1 % to 1.3 %. It is found that the introduction of the nanodiamond particles into a magnesium melt contributes to a decrease in the average grain size from ~ 100 to 64 pm in the obtained castings and, as a result, to an increase in the mechanical properties.
This paper establishes the optimal thickness of TiN ceramic coating on the surface of Mg-Ca-Zn alloy using optical and scanning microscopy methods. X-ray diffraction analysis and tests on its mechanical properties showed that deposition of coating with a thickness of not less than 1 μm on the alloy causes a uniform distribution of the TiN phase over the magnesium alloy surface. The TiN coating also contributes to simultaneous increases in the yield strength, tensile strength, ductility and microhardness of the Mg-Ca-Zn alloy.
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