A comprehensive description of reactions between nickel and aluminum powders during reactive sintering

Školáková, Andrea; Körberová, Jana; Kratochvíl, Petr; Salvetr, Pavel; Deduytsche, Davy; Novák, Pavel

doi:10.1016/j.matchemphys.2021.124941

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…The intermetallic has the highest content of Al that contains unreacted Ni, Al, NiAl3, and Ni2Al3. The annealing temperature does not affect the particle size [4], [8], [13]. The two phases, Ni2Al3 and NiAl3, were highly noticeable from peaks and microstructure.…”

Section: Scanning Electron Microscopymentioning

confidence: 96%

“…JCDPS file helps to find the peak positions, full width at half maximum (FWHM), crystal structure, and lattice parameters. The crystallite size was measured using Scherrer equation [4].…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 99%

“…After sintering, the samples were cooled by furnace cooling. Uniform distribution of particles would be achieved via sintering [2], [4]. During sintering the reaction were happened as follows:…”

Section: Sintering Mechanismmentioning

confidence: 99%

“…On the other hand, EARS demonstrated higher hardness and lower porosity in comparison to EISHS [3]. Skolakova et al [4] reported the chemical reaction between nickel and aluminum using RS. They investigated three different compositions (Ni-14Al, Ni-30Al, and Ni-58Al) and varied heat treatment conditions (400-600 °C for 8 to 48 hours).…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Ni-Al Intermetallic Compounds Fabricated through Reactive Sintering Processes

Azhagarsamy,

Sekar,

Murali

2023

MSF

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The utilization of nickel aluminide compounds in high-temperature structural applications is advantageous due to their desirable properties. One efficient method for producing nickel aluminide samples with desirable chemical reactions using minimal energy is reactive sintering. In this study, Ni-Al (20 wt.%-80 wt.%) compounds were fabricated by initially cold pressing them, followed by reactive sintering. The reactive sintering process resulted in the formation of NiAl3 and Ni2Al3 phases within the Ni-Al compounds. The microstructure, porosity, and hardness of the samples were thoroughly examined and analyzed. Generally, the compounds produced through reactive sintering exhibited significant porosity attributed to shrinkage and the Kirkendall effect. Microstructural analysis confirmed the presence of porosity, NiAl3, and Ni2Al3 phases. The sintered sample processed at 400 °C demonstrated higher density and hardness. Additionally, the wear test indicated a low wear rate and friction coefficient for the sintered sample processed at 400 °C.

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Section: Scanning Electron Microscopymentioning

confidence: 96%

“…JCDPS file helps to find the peak positions, full width at half maximum (FWHM), crystal structure, and lattice parameters. The crystallite size was measured using Scherrer equation [4].…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 99%

Section: Sintering Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation on Ni-Al Intermetallic Compounds Fabricated through Reactive Sintering Processes

Azhagarsamy,

Sekar,

Murali

2023

MSF

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“…Special attention in the manufacture of Ni-Al Materials 2023, 16,1907 2 of 21 alloys deserves the technology of powder metallurgy as an important tool that allows abating the adverse effect of brittleness [2] through the use of various manufacturing methods [20,21], microstructure optimization [22,23] or ultra-fine grain refinement [24]. Numerous variations of the sintering process have been used to meet this goal, starting with free sintering [25,26], through the techniques that use both high sintering temperatures (HP-hot pressing, HIP-hot isostatic pressing) [22,27,28] and high sintering pressure (HPHT-high pressure high temperature) [29,30], and ending in the methods where thermal effects are obtained by the use of direct current, alternating current or pulsed current (SPS-spark plasma sintering) [31][32][33]. Currently, scientists are particularly interested in the SPS method.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

et al. 2023

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As part of extensive research on the properties of nickel-aluminum alloys, corrosion tests of sintered materials produced by the innovative HPHT/SPS (high pressure, high temperature/spark plasma sintering) method were performed in 0.1 molar H2SO4 acid. The hybrid, unique device used for this purpose (one of only two such devices operating in the world) is equipped with a Bridgman chamber, which allows heating with high-frequency pulsed current and sintering of powders under high pressure in the range of 4–8 GPa and at temperatures up to 2400 °C. Using this device for the production of materials contributes to the generation of new phases not obtainable by classical methods. In this article, the first test results obtained for the nickel-aluminum alloys never before produced by this method are discussed. Alloys containing 25 at.% Al, 37 at.% Al and 50 at.% Al were produced. The alloys were obtained by the combined effect of the pressure of 7 GPa and the temperature of 1200 °C generated by the pulsed current. The time of the sintering process was 60 s. The electrochemical tests, such as OCP (open circuit potential), polarization tests and EIS (electrochemical impedance spectroscopy), were carried out for the newly produced sinters and the results were compared with the reference materials, i.e., nickel and aluminum. The corrosion tests showed good corrosion resistance of the produced sinters, with corrosion rates of 0.091, 0.073 and 0.127 mm per year, respectively. It leaves no doubt that the good resistance of materials synthesized by powder metallurgy is due to the proper selection of the manufacturing process parameters, ensuring a high degree of material consolidation. This was further confirmed by the examinations of microstructure (optical microscopy and scanning electron microscopy) and the results of density tests (hydrostatic method). It has been shown that the obtained sinters were characterized by a compact, homogeneous and pore-free structure, though at the same time differentiated and multi-phase, while the densities of individual alloys reached a level close to the theoretical values. The Vickers hardness of the alloys was 334, 399 and 486 HV10, respectively.

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Effect of molybdenum concentration on mechanical, microstructural, corrosion, and tribological properties of (Al3Ni–Al3Ni2)100-x -Mox (x= 3, 5, and 7 wt%) composites

Azhagarsamy,

Sekar,

Murali

et al. 2024

Intermetallics

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A comprehensive description of reactions between nickel and aluminum powders during reactive sintering

Cited by 7 publications

References 41 publications

Investigation on Ni-Al Intermetallic Compounds Fabricated through Reactive Sintering Processes

Investigation on Ni-Al Intermetallic Compounds Fabricated through Reactive Sintering Processes

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

Effect of molybdenum concentration on mechanical, microstructural, corrosion, and tribological properties of (Al3Ni–Al3Ni2)100-x -Mox (x= 3, 5, and 7 wt%) composites

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