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The scientific basis for the creation of new heat-resistant titanium alloys, niobium, molybdenum, reinforced borides


Work number - M 70

Presented by the Institute for Problems of Materials I. M. FrantsevychNAS of Ukraine.

Author: Potazhevskaya Oksana, Ph.D., Junior Researcher of the Institute for Problems of Material ScienceI. M. Frantsevych, NAS of Ukraine.

The aim is to construct diagrams of the systems Ti‒Mo‒B and Nb‒Mo‒B in the full concentration range in melting/crystallization using thermodynamic modeling of the system Ti‒Mo‒B; assess the level of physical and mechanical properties of alloys metalborides and formulate recommendations for their possible use.

The authors on the basis of theoretical studies and experiments constructed state diagrams of Ti‒Mo‒B and Nb‒Mo‒B as projections solidus surfaces liquidus melting reaction schemes and diagrams during crystallization. For the first time the thermodynamic modeling method CALPHAD obtained thermodynamic description of the system Ti‒Mo‒B and clarified the thermodynamic description of the system B‒Mo, well reproduce the experimental data. It was determined that increasing the molybdenum content in the alloys eutectic systems metalborides Ti‒Mo‒B and Nb‒Mo‒B and increases their hardness increases sharply softening start temperature of about 200 °C, that is, their heat resistance is significantly increased.

The scientific foundations of alloys of Ti‒Mo‒B and Nb‒Mo‒B, which make a significant contribution to the understanding of the nature of physical and chemical interaction in the studied systems, and is a reference tool that allows to solve a number of important practical problems in the development of new high-temperature alloys. Thermodynamic models developed systems B‒Mo and Ti‒Mo‒B will be used for the thermodynamic modeling of higher order systems with their participation.

Proposed state charting a scientific basis for the creation of modern technologies for the production of heat-resistant and heat-resistant materials and coatings. Thus, the interrelation between the composition and their alloys metalborides hardness in the temperature range from room temperature to 900 °C is the basis for selecting the composition of these materials and recommendations for production technologies.

Number of publications: 12, including Articles 6 (4 – in foreign editions). According to the database Scopus data the total number of references to the publication of the authors represented in the work, is 2 h-index (for the work) = 1; according to the base Google Shcolar data the total number of links – is 3, h-index (for the work) = 2.