Evolution of intermetallic compounds in Ti-Al-Nb system by the action of mechanoactivation and spark plasma sintering

Kozhakhmetov, Yernat; Skakov, Маzhyn; Wieleba, Wojciech; Kurbanbekov, Sherzod; Mukhamedova, Nuriya

doi:10.3934/matersci.2020.2.182

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…At the same time, an increased content of Nb is observed in this region. A more detailed analysis of the evolution of the microstructure of mechanically activated powder mixtures and the mechanism of formation of secondary phases depending on the temperature of SPS was described by the authors in [25][26][27].…”

Section: Structural and Phase State Of Samples After Sinteringmentioning

confidence: 99%

Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System

et al. 2022

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In this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of 1300 °C make it possible to obtain an alloy with a predominantly bimodal structure. However, an insignificant presence of TiAl3, AlNb2 phases, and unreacted niobium is still observed in the structure. The mechanical properties of alloys of the Ti-Al-Nb system after sintering show abnormally low values of strength and ductility (less than 150 MPa). Two-stage heat treatment of alloys of the Ti-Al-Nb system leads to the decomposition of large precipitates of TiAl3 with the formation of O-phase nuclei, as well as to the complete dissolution of unreacted niobium and AlNb2 phases. Heat treatment of alloys of the Ti-Al-Nb system contributes to an increase in its strength by approximately 10 times (1310 MPa, MA-180), and ductility by 2 times (1322 MPa, MA-20). The surface fracture of samples obtained after testing is characterized by intergranular (intercrystalline) brittle fracture with “river” or “step” features.

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Section: Structural and Phase State Of Samples After Sinteringmentioning

confidence: 99%

Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System

et al. 2022

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“…The main results on the study of MA parameters influence the morphology and structure formation of composite particles in a mixture based on the Ti-25Al-25Nb (at%) system are given by the authors in [16,17].…”

Section: Mechanical Activationmentioning

confidence: 99%

“…In particular, it was shown in [16] that during MA, most of Al was dissolved in the Ti and Nb lattices by interpenetration with the formation of solid solutions (Ti, Al) and (Nb, Al). Thus, during MA, as a result multiple effects of "cold welding" Al, Ti, Nb are destroyed and formed into layered composite particles.…”

Section: Mechanical Activationmentioning

confidence: 99%

Powder Composition Structurization of the Ti-25Al-25Nb (at.%) System upon Mechanical Activation and Subsequent Spark Plasma Sintering

Kozhakhmetov

Skakov

Kurbanbekov

et al. 2021

Eurasian Chem. Tech. J.

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The results of a study of the microstructure evolution of pre-mechanically activated elementary powders based on the Ti-25Al-25Nb (at.%) compositions differing in the particle size of the aluminum (Al) component are presented. It was found that during the mechanical activation, most of the Al was dissolved in the Ti and Nb lattices by interpenetration with the formation of solid solutions (Ti, Al) and (Nb, Al). It has been established that an increase in temperature to 1400 °C, when sintering powder materials based on the Ti-Al-Nb system, leads to a sharp increase in the temperature of Al particles, as a result of the melting of which it is impossible to control the phase formation, which ultimately leads to the difficulty of obtaining the required product. It was determined that in the process of spark-plasma sintering of mechanically activated compositions, intermetallic compounds are formed based on phases ‒ α2, B2 and O, and with an increase in the sintering temperature, their morphology and distribution in the alloy volume change.

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“…Without this step, the powders remain in a passive (chemically low-activity) phase. Therefore, their direct use in mining and metallurgical, machine-building, construction and other fields is less effective [17][18][19]. The need to optimize the alloy dispersion process and hydrogen reduction treatment of the obtained powders is especially acute when dispersing active metal alloys such as aluminum, magnesium, Armco Iron, low-carbon alloyed steels, modified cast iron, etc.…”

Section: Introductionmentioning

confidence: 99%

A novel method of hydro-vacuum dispersion of metallurgical melts: research and implementation

Sakhvadze,

Jandieri,

Saralidze

et al. 2024

Sediment Transport Research - Further Recent Advances

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In parallel with the gradual expansion of the consumption of powder materials and the increasing demands placed on them, the competition between the producers of powders is continually intensifying. There is no doubt that the future belongs to technologies that provide high productivity and low-cost powders. Consequently, the technology and techniques of powder production need constant revision and modernization. For this goal we have developed and proposed a new method and installation for hydro-vacuum dispersion of melts, the essence of innovation and advantage of which lies in sucking and dispersing the melt in the direction opposite to the action of the force of gravity, under gravity overload 150-200g conditions, where the main work is performed by hydraulic rarefaction resulting from a sharp refraction of direction (on 162-degree angle) and rapid expansion (х10) of a high-pressure water annular flow, with the superimposition of spatial shock- pulsating waves generated in the outer shell of the formed cone-shaped vortex. The device is characterized by high production and low energy costs, while powders - by increased specific surface, improved purity and high activity. The enhanced activity of our powders is due to the formation of non-equilibrium mechanoactivation structural-deformation stresses in them, which leads to the accumulation of excess chemical energy in them. It is justified that the application of the method is also highly effective for dispersing slag melts and obtaining amorphous hardened powdery raw materials with high hydraulic activity, suitable for the production of construction cement. Appropriate recommendations for the industrial implementation of the developed innovative technology have been proposed.

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Evolution of intermetallic compounds in Ti-Al-Nb system by the action of mechanoactivation and spark plasma sintering

Cited by 9 publications

References 11 publications

Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System

Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System

Powder Composition Structurization of the Ti-25Al-25Nb (at.%) System upon Mechanical Activation and Subsequent Spark Plasma Sintering

A novel method of hydro-vacuum dispersion of metallurgical melts: research and implementation

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