NiAl powder alloys: I. Production of NiAl powders

Povarova, K. B.; Skachkov, O. A.; Kazanskaya, N. K.; Дроздов, А. А.; Морозов, А. Е.; Makarevich, O. N.

doi:10.1134/s0036029511090199

Cited by 9 publications

(6 citation statements)

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“…A good correspondence of the SPS activation energy of the nanopowders to the data on the activation energy of the diffusion processes reported in the literature was observed for m = 1 (Table 4). The value of m = 1 allows concluding the sintering kinetics of the nanopowders W-7%Ni-3%Fe to be determined by the Coble creep intensity.…”

Section: Discussionsupporting

confidence: 74%

“…Tungsten is known to have a high solubility in nickel. At elevated temperatures, the concentration of the W atoms in the -phase can reach 25-28% [4]. Partial dissolving of the -W nanopowders in the -phase takes place during sintering that leads to a decrease in the density of the sintered W-Ni-Fe samples.…”

Section: Discussionmentioning

confidence: 99%

“…Heavy tungsten alloys (HTAs) of the W-Ni-Fe system with the W contents over 85-90% have a number of unique characteristics: simultaneous increased density, strength, and plasticity at room temperature [1][2][3][4][5], high characteristics of dynamic strength [6,7], high radiation resistance, etc. The industrial tungsten alloys with 90-95%W obtained by conventional liquid-phase sintering (LPS) have the density of 17-19 g/cm 3 , the ultimate strength up to 1000 MPa, and elongation to failure up to 25-30% at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Нохрин¹,

Малехонова²,

Чувильдеев³

et al. 2023

Preprint

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The present work was aimed at the investigation of effect of High Energy Ball Milling (HEBM) time on the sintering kinetics, structure, and properties of heavy tungsten alloy (HTA) W-7%Ni-3%Fe. The HTA samples were obtained from the nanopowders (20-80 nm) by conventional liquid phase sintering (LPS) in hydrogen and by Spark Plasma Sintering (SPS) in vacuum. The HTA density was shown to depend on the HEBM time non-monotonously that originates from the formation of non-equilibrium solid solutions in the W-Ni-Fe systems during HEBM. The SPS kinetics of the HTA nanopowders was shown to have a two-stage character, the intensity of which depends on the Coble diffusion creep rate and on the intensity of diffusion of the tungsten atoms in the crystal lattice of the -phase. The kinetics of sintering of the initial submicron powders have a single-stage character originating from the intensity of the grain boundary diffusion in the -phase. The dependencies of the hardness and of the yield strength on the grain sizes were found to obey the Hall-Petch relation. The hardness, strength, and dynamic strength in the compression tests of the fine-grained tungsten alloys obtained by SPS and LPS were studied.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Нохрин¹,

Малехонова²,

Чувильдеев³

et al. 2023

Preprint

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“…Поскольку плотность компактного материала (ρ≥90% от теоретической), обеспечивающая возможность дальнейшей обработки материала и достижение близкой к теоретической плотности на последующих стадиях обработки, может быть достигнута только при условии проведения реакционного спекания под давлением [9], компактные образцы из исходных и механоактивированных смесей получали путем нагрева холоднопрессованных заготовок до 700°С в атмосфере аргона при давлении P=85±25 МПа (850±250 кг/см 2 ) и выдержке 2 часа. Пористость образцов из механоактивированных порошков А15, А16 не превышала 5 об.…”

Section: материалы и методика экспериментаunclassified

Effect of work hardening and nanostructuring upon short-term mechanical activation of Ru-Al and Ni-Al powder mixtures on the structure of compact sintered samples

Морозов¹,

Дроздов²,

Povarova³

et al. 2015

LoM

Self Cite

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“…NiAl powders can be produced by different methods with certain compositions by using elemental powder mixtures of nickel and aluminum such as reactive sintering and combustion synthesis [1,5,6]. In the study of Portnoy et al [1], NiAl powders were produced through mechanical alloying of Ni and Al powders.…”

Section: Introductionmentioning

confidence: 99%

Production and Characterization of Ni0.50 Al0.50 and Ni0.55 Al0.45 Powders by Volume Combustion Synthesis

Sarıyer,

Çamurlu

2024

Cumhuriyet Science Journal

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Nickel aluminide (NiAl) is an essential intermetallic material with a high melting point and excellent high temperature corrosion resistance. It is a solid solution of Ni and Al in 40-61 mol.% Ni range. In this study, Ni0.50Al0.50 and Ni0.55Al0.45 powders were formed by using nickel and aluminum elemental powders through volume combustion synthesis (VCS). MgO powder was utilized as the thermal diluent. According to adiabatic temperature calculations, MgO was added to the reactant mixture in 10-40 vol.% range for preventing the melting and sintering of the formed Ni0.50Al0.50 and Ni0.55Al0.45 particles. After VCS, the products were ground into powder form and leached in 3M HCl solution in order to remove the MgO particles. After VCS, the samples which were obtained with 10 - 30 vol.% MgO addition were quite hard and difficult to grind. This indicated the partial sintering of the formed particles. It was relatively easier to grind into powder form the samples which contained 40 vol.% MgO. Therefore, it was determined that the most suitable MgO ratio for the formation of Ni0.50Al0.50 and Ni0.55Al0.45 powders was 40 vol.%. Formed powders were mostly in 5-100 µm particle size range. The formation of single phase pure powders was confirmed by the XRD analyses. A shift of about 0.1 degrees to higher 2-theta values was determined in the XRD peaks of the Ni0.55Al0.45 powder as compared to the Ni0.50Al0.50 phase, after annealing the powders. The results were in agreement with the crystallographic data.

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NiAl powder alloys: I. Production of NiAl powders

Cited by 9 publications

References 1 publication

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Effect of work hardening and nanostructuring upon short-term mechanical activation of Ru-Al and Ni-Al powder mixtures on the structure of compact sintered samples

Production and Characterization of Ni0.50 Al0.50 and Ni0.55 Al0.45 Powders by Volume Combustion Synthesis

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