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Лапшин, О. В.; Овчаренко, В. Е.; Boyangin, E. N.

doi:10.1023/a:1016259131911

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Therefore, the initially high temperature (in the range from 1250 to 1300 K, figure 7) in these cornered lobes of the mesocells provides Ni-atoms with a higher diffusion mobility as compared to Ni-atoms in the central mesocell, where the temperature during the time tign is approximately 200 K lower. This SHS mode for cornered mesocells is close to the "thermal explosion" mode upon initiation of SHS and, as is known [8], taking into account the mass content of particles (68.5wt.%Ni, 31.5wt.%Al), the formation of the ε-phase (Ni3Al) is preferable , which is confirmed by figure 8. That is, within the time interval up to tign = 0.2 ms, the thickness of only one ε-phase (Ni3Al) grows at a high rate.…”

supporting

confidence: 77%

Computer 3D-simulation of the temperature and diffusion kinetics of SHS in the closest packing of Ni@Al “core-shell” mesocells for modes with variable values of the key ignition parameters

Shmakov

Jordan

2021

J. Phys.: Conf. Ser.

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The paper presents the results of computer 3D-simulation of the temperature and diffusion kinetics of SHS in a test model cluster of Ni-Al particles for modes with variable values of the key parameters of the SHS combustion wave ignition. The key parameters for the SHS combustion wave ignition were chosen as follows: the initial temperature for preliminary heating of the Ni-Al particles mixture, the ignition temperature of the combustion wave in the mixture of Ni-Al particles, the duration of the action of the heat pulse until the combustion wave ignition, and the thickness of the ignited layer in the mixture of particles. A program has been created to generate a test model cluster in the form of the closest ball packing of the Ni@Al “core-shell” mesocells (CBP-structure cluster of the Ni@Al “core-shell” mesocells). Using such a CBP-structure cluster, was continued a testing of created software package intended for 3D-simulation of SHS macrokinetics in a heterogeneous particle mixture, taking into account parallel MPI-calculations. In addition, the value ranges of the key parameters of the SHS combustion wave ignition for which the simulation results are in adequate agreement with the experimental data are determined as the parameters of the program model for SHS-simulation. The results of computational experiments have shown that diffusion kinetics is interrelated with temperature kinetics, and in mesocells with different locations within the CBP-structure cluster, the formation of intermetallic phases occurs inhomogeneously.

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confidence: 77%

Computer 3D-simulation of the temperature and diffusion kinetics of SHS in the closest packing of Ni@Al “core-shell” mesocells for modes with variable values of the key ignition parameters

Shmakov

Jordan

2021

J. Phys.: Conf. Ser.

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“…Currently, the problem of obtaining aluminides and their alloys has been solved by the traditional foundry technologies and powder metallurgy, which do not fully meet modern requirements. The proposed approach makes it possible to obtain complex nickel aluminides by means of a joint aluminothermic reduction of metal oxides [20]. It significantly simplifies the technology and reduces the production cost of new high-temperature, heat-resistant materials, which are intended for power engineering, aviation and automotive industries.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

Gostishchev

et al. 2018

Metals

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This paper deals with the investigation of complex-alloyed nickel aluminides obtained from oxide compounds by aluminothermic reduction. The aim of the work was to study and develop the physicochemical basis for obtaining complex-alloyed nickel aluminides and their application for enhancing the properties of coatings made by electrospark deposition (ESD) on steel castings, as well as their use as grain refiners for tin bronze. The peculiarities of microstructure formation of master alloys based on the Al-TM (transition metal) system were studied using optical, electronic scanning microscopy and X-ray spectral microanalysis. There were regularities found in the formation of structural components of aluminum alloys (

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Thermokinetic characteristics of the final stage of the thermal shock of the 3Ni + Al + TiC powder mixture

Лапшин

Boyangin

Овчаренко

2005

Combust Explos Shock Waves

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Thermography and powder x-ray diffraction analysis were employed to examine hightemperature synthesis of nickel aluminide Ni 3 Al based intermetallic composite materials by the thermal shock of a powder mixture of pure elements with an inert filler. The influence of the inert component on the phase composition of the final product of the synthesis reaction is studied. The final product is assumed to be formed owing to reaction diffusion at the stage of cooling of the thermoreactive powder system. Thermokinetic constants of formation of the NiAl and Ni 3 Al phases are estimated. Regions of optimum regimes of high-temperature synthesis of the intermetallide Ni 3 Al are determined.

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Untitled

Cited by 6 publications

References 8 publications

Computer 3D-simulation of the temperature and diffusion kinetics of SHS in the closest packing of Ni@Al “core-shell” mesocells for modes with variable values of the key ignition parameters

Computer 3D-simulation of the temperature and diffusion kinetics of SHS in the closest packing of Ni@Al “core-shell” mesocells for modes with variable values of the key ignition parameters

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

Thermokinetic characteristics of the final stage of the thermal shock of the 3Ni + Al + TiC powder mixture

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