This work presents results in the field of synthesis of new metal matrix composites with matrix NiTi and particles TiB 2 , and their use as additives to fabricate metal matrix composites based on the Inconel 625 alloy. NiTi-TB 2 powders were obtained using self-propagating high-temperature synthesis. Composite NiTi-TiB 2 particles were spheroidized on a high-frequency induction plasmatron. Composite NiTi-TB 2 particles were mixed with metallic Inconel 625 powder with particle sizes of 50-150 µm. We used direct laser deposition by means of mixture of powders to grow samples with different contents of ceramics in the metal matrix. The process of direct laser deposition during the experiment was investigated. We have determined the peculiarities of the formation of the structure in metal matrix composites with different contents of titanium diboride. We have demonstrated the possibility of using Direct Laser Deposition (DLD) for fabricating items from ceramic metal materials. We have determined promising fields of further research for the purpose of obtaining efficient metal matrix composites using additive manufacturing technologies.

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The physical processes which have an influence on the change in chemical composition of the weld seam during laser beam welding are analysed in this paper. The problem of evaporation and diffusion of admixtures has been solved. The results of the calculations agree well with experimental data.

This paper deals with the theoretical analysis of plasma phenomena in the keyhole during laser welding. The mathematical model based on the kinetic equation for optical discharge is presented. The influence of the beam intensity and the keyhole radius on the plasma properties is shown. The temperatures of the plasma electrons, delivered by the model, correspond to the experimental data.

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