Recrystallization of tungsten in tungsten-nickel-iron alloys

Frantsevich, I. N.; Teodorovich, O. K.; Bazhenova, L. G.

doi:10.1007/bf00775397

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structure of the alloy is formed during liquid-phase sintering, and it is a twophase system with low-melting and refractory components. The powder variant of the alloy was obtained by the technology developed by the authors of [1,2]. We mechanically mixed the starting components to prepare heterogeneous mixtures of two compositions: 50% Cu − 50% (W − Ni − Fe) (composition 1, calculated density of the mixture 11.77 g/cm 3 ) and 80% Cu − 20% (W − Ni − Fe) (composition 2, calculated density 9.91 g/cm 3 ).…”

Section: Methodsmentioning

confidence: 99%

Effect of a rigid component (tungsten alloy) on the process of formation of mixtures based on copper powder and the properties of heterogeneous unsintered compacts

Epifantseva

Podrezov

Verbilo

et al. 2005

Powder Metall Met Ceram

View full text Add to dashboard Cite

621.762We have analyzed the process of structure formation during pressing of copper-tungsten composites. We have established the effect of the amount of the rigid phase (tungsten alloy) in the mix on the pattern of structure formation and the properties (Young's modulus and bending strength) of unsintered articles made from heterogeneous powder material based on copper. We have experimentally established that despite the substantially higher porosity and high volume fraction of the rigid phase, specimens of composition Cu − 50% W alloy have higher green strength and higher modulus of elasticity. Analysis of the true stress − true strain curves of the porous cold-pressed articles compared with the results of microstructural studies allowed us to determine the effect of the structure formation pattern on the strength properties of articles made from copper-based powder material containing tungsten alloy. By studying the structural features of the porous articles, we determined the mechanism for creation of interparticle contact which determines the strength characteristics of unsintered compacts of heterogeneous composition based on a plastic matrix with different amounts of the rigid phase.

show abstract

Section: Methodsmentioning

confidence: 99%

Effect of a rigid component (tungsten alloy) on the process of formation of mixtures based on copper powder and the properties of heterogeneous unsintered compacts

Epifantseva

Podrezov

Verbilo

et al. 2005

Powder Metall Met Ceram

View full text Add to dashboard Cite

show abstract

“…The heavy tungsten-based alloy, produced by co-reduction of mechanically mixed oxygen-containing components, has been extensively studied [4,5].…”

Section: Materials and Techniquementioning

confidence: 99%

Effect of focused solar power on the structure and phase composition of a copper-based material

Kayuk

Epifantseva

Kоval

et al. 2007

Powder Metall Met Ceram

View full text Add to dashboard Cite

621.762The change in the content, structure, and microhardness at a depth of the scale layer, which forms on the copper-based material under focused solar radiation, is studied. The formation of a structure with an external layer of CuO, Fe 2 O 3 , NiO oxides and mixed Cu 3 WO 6 oxide (spinel type) with high microhardness H μ = 29.4 GPa is shown.The use of solar energy in recent years has intensified significantly. This is practically an inexhaustible source providing pure heating. Solar energy can be focused into a high-intensity beam to be used for different processes: welding, cutting, soldering, single-crystal growing, and remelting in both land-based and space facilities [1].The copper-based structural material 80 wt.% Cu-20 wt.% W alloy (90 wt.% W-7 wt.% Ni-3 wt.% Fe) with solid inclusions of a tungsten alloy exhibits excellent mechanical properties and corrosion resistance [2]. Should a heterogeneous powder material be used under extreme conditions, changes in its properties -caused, for example, by focused solar beams -must be revealed depending on the parameters of the external influence. Using a copper-based powder material for borehole perforation [3] assumes short-term high temperatures. However, changes in the initial properties of the powder material have been studied inadequately. The objective of this paper is to study the effect of focused solar radiation (FSR) on the phase composition and structure of the heterogeneous powder material 80 wt.% Cu-20 wt.% W alloy . MATERIALS AND TECHNIQUEThe original components were: PMS-1 electrolytic copper powder (bottle density ρ = 8.86 g/cm 3 ) with dendrite-like particles of 100 μm (GOST 4960-75) and tungsten alloy powder (90 wt.% W-7 wt.% Ni-3 wt.% Fe) with average particle size 28.6 μm (ρ = 17.1 g/cm 3 ). The heavy tungsten-based alloy, produced by co-reduction of mechanically mixed oxygen-containing components, has been extensively studied [4,5].The W-Ni-Fe alloy was produced by a powder metallurgy technique. The initial powders of tungsten anhydrite, nickel carbonate, and iron oxide were wet-mixed in a set ratio. The mixture, dried at 150°C and sifted through a 045-mesh screen, was hydrogen-reduced in two stages: at 600°C for 4 h and at 900°C for 5 h. The original components were mechanically agitated to form a heterogeneous mixture 80 wt.% Cu-20 wt.% W alloy , with a combined density of 9.91 g/cm 3 . The mixture was compacted by double-action pressing at 800 MPa.The grain-size distribution of the tungsten alloy powder was examined using SIAMS-600 image processing software (developed by SIAMS Ltd, Ekaterinburg, Russia, http://siams.com).

show abstract

Strain aging in tungsten heavy alloys

Dowding

Tauer

1991

Scripta Metallurgica et Materialia

View full text Add to dashboard Cite

Recrystallization of tungsten in tungsten-nickel-iron alloys

Cited by 3 publications

References 0 publications

Effect of a rigid component (tungsten alloy) on the process of formation of mixtures based on copper powder and the properties of heterogeneous unsintered compacts

Effect of a rigid component (tungsten alloy) on the process of formation of mixtures based on copper powder and the properties of heterogeneous unsintered compacts

Effect of focused solar power on the structure and phase composition of a copper-based material

Strain aging in tungsten heavy alloys

Contact Info

Product

Resources

About