The influence of mechanical activation on the adsorption properties of powdered tungsten

Малкин, А. И.; Фомкин, А. А.; Klyuev, V. A.; Loznetsova, N. N.; Popov, Dušan; Toporov, Yu. P.; Школин, А. В.

doi:10.1134/s2070205115010086

Cited by 3 publications

(1 citation statement)

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“…A nonmonotonic dependence of hardness and fracture resistance on milling time was also observed [58]. Malkin's group showed that HEBM changes the adsorption properties of tungsten powders [59], changes the heat capacity of tungsten powders [60], and leads to the formation of strong internal stresses and microstrains of the crystal lattice of tungsten powders and increases their reactivity [61]. Thus, HEBM is an effective method for changing the size, structure, and properties of tungsten powders.…”

Section: Introductionmentioning

confidence: 99%

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

Нохрин

Малехонова

Чувильдеев

et al. 2023

Metals

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The present work was aimed at the investigation of the effect of high-energy ball milling (HEBM) time on the sintering kinetics, structure, and properties of the heavy tungsten alloy (HTA) W-7%Ni-3%Fe. The HTA samples were obtained from nanopowders (20–80 nm) using conventional liquid-phase sintering (LPS) in hydrogen and using spark plasma sintering (SPS) in vacuum. The HTA density was shown to depend non-monotonously on the HEBM time that originates from the formation of nonequilibrium 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 γ-phase. The kinetics of sintering of the initial submicron powders has a single-stage character originating from the intensity of the grain boundary diffusion in the γ-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 using SPS and LPS were studied.

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