Thermodynamic modelling of the V–Ti–B system

Yazlak, M.; Christ, Hans‐Jürgen; Yang, Weiguang; Hasemann, Georg; Krüger, Manja; Gorr, Bronislava

doi:10.1016/j.calphad.2022.102477

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…However, considering the brighter zone, the amount of Ti is 36.4 at% and the concentration of B is 63.6 at%. The binary Ti-B phase diagram shows that the analyzed brighter zone fully corresponds to the TiB 2 compound [28]. Also, it should be noted that some defects, like pores, cracks, etc., exist (marked with black arrows in Figure 3).…”

Section: Resultsmentioning

confidence: 89%

“…It was found that the amount of boron is 67 at% while the titanium amount is 33 at%, corresponding to an ideal 2:1 ratio. The binary Ti-B phase diagram shows that the considered zone fully corresponds to the TiB2 compound[28]. When comparing the two alloyed zones, no noticeable difference between their phase compositions can be established, apart from a slightly higher concentration of pure undissolved boron in the structure of the specimen treated with the higher movement speed.…”

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confidence: 92%

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Fabrication and Characterization of Titanium Borides by Electron Beam Surface Alloying

Padikova,

Nedeva,

Dunchev

et al. 2023

Coatings

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This study shows the possibility of the fabrication of titanium borides by an alloying of a titanium substrate with boron powder via a scanning electron beam. During the electron beam alloying experiments, the speed movement of the specimens was varied, where it was 4 and 6 mm/s. The thickness of the alloyed zone formed by the lower velocity of the movement of the workpiece is greater than that of the coating obtained by the higher speed movement. The phase composition of the coatings is in the form of the TiB2 phase, as well as some amount of undissolved boron in both considered cases. In the case of the lower speed of the movement of the sample, the undissolved boron is within the whole volume of the alloyed zone, while at the higher speed movement, it is on the top of the specimen. The hardness of the obtained coatings by the higher speed of the specimen movement reached values of about 4500 HV. Considering the values of the surface alloy fabricated via the lower velocity movement of 4 mm/s, it is about 2500 HV, which is lower than that of the one obtained by the 6 mm/s speed of the sample movement. The result obtained for the friction coefficient (COF) for the specimen alloyed by the speed of the specimen motion of 4 mm/s is 0.40; the value for the coating obtained at a speed movement of 6 mm/s is 0.34. In both cases, these values are lower than that of the titanium substrate.

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Section: Resultsmentioning

confidence: 89%

mentioning

confidence: 92%

Fabrication and Characterization of Titanium Borides by Electron Beam Surface Alloying

Padikova,

Nedeva,

Dunchev

et al. 2023

Coatings

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show abstract

“…The thermodynamic properties of each phase that takes part in the transformations are described by appropriate models, which for phases of constant composition should take into account the temperature dependence, and, in addition, for phases that have a region of homogeneity, the temperature-concentration dependence of the Gibbs energy [15]. This approach was used to model the behavior of the multicomponent reacting systems Nb-Ni-Si [16], Cr-Mn-Si [17], C-Nb-Mo [18], B-Fe-Ti [19], B-Mo-Ti [20], B-Mo-Nb [21], V-Ti-B [22], and many others, and allowed modeling of the corresponding state diagrams. The CALPHAD method is the mathematical basis of software products such as "Thermo-Calc", "JMathPro", "Pandat", "Pycalphad", etc.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Conditions of Boron–Siliconizing of Molybdenum-Based Alloys in Chlorine and Fluorine Medium

Loskutova,

Scheffler,

Ivanov

et al. 2024

Metals

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The physicochemical conditions of the siliconizing and boron–siliconizing processes of molybdenum-based alloys in a closed reaction space in an environment of chlorine and fluorine at reduced pressure were studied. Theoretical calculations of the equilibrium composition of systems with the participation of silicon, boron, molybdenum, nitrogen, oxygen, chlorine, and fluorine were carried out, which made it possible to determine the influence of process parameters (temperature, composition of the reaction medium) on the probable phase composition of the obtained coatings. Based on thermodynamic calculations, the composition and rational consumption of the initial powders and the temperature intervals of the chemical heat treatment (CHT) during the complex saturation of molybdenum-based alloys with silicon and boron were modeled. It was established that it is advisable to use chlorine as an activator, which leads to the formation of molybdenum chlorides MoCl4 and MoCl3 in the composition of the gas phase and can indicate the flow of exchange reactions between chlorides and the matrix of the processed material in the reaction space. The rational saturation temperature of alloys based on molybdenum with silicon and boron is determined—1100–1250 °C. The possibility of the existence of condensed phases MoSi2, MoB2.15, B6Si, MoB1.65, and MoB is shown.

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Evolution of (Ti, V) Compounds in the Al-Ti-V-B System and the Refinement Performance Thereof

Ran,

Hu,

Liu

et al. 2024

JOM

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Thermodynamic modelling of the V–Ti–B system

Cited by 4 publications

References 26 publications

Fabrication and Characterization of Titanium Borides by Electron Beam Surface Alloying

Fabrication and Characterization of Titanium Borides by Electron Beam Surface Alloying

Physicochemical Conditions of Boron–Siliconizing of Molybdenum-Based Alloys in Chlorine and Fluorine Medium

Evolution of (Ti, V) Compounds in the Al-Ti-V-B System and the Refinement Performance Thereof

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