Tungsten heavy alloy: deformation texture and recrystallization of tungsten particles

Ekbom, L.; Antonsson, Tomas

doi:10.1016/s0263-4368(02)00035-5

Cited by 25 publications

(8 citation statements)

References 3 publications

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“…Development of <101> fiber texture after severe deformation in W-B2 phase of THAs was reported previously. For example, Ekbom et al [39] observed <101> texture in a heavy alloy (90W, 7Ni, 3Fe) prepared by sintering and deformed either in a tensile testing machine or by extrusion. Gong et al [20] determined <101> texture in tungsten phase of fine-grained 93W-4.9Ni-2.1Fe-0.03Y (wt.%) alloy after hot extrusion.…”

Section: Discussionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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Knowledge of texture and residual stresses in tungsten heavy pseudoalloys is substantial for the microstructure optimization. These characteristics were determined in cold and warm rotary swaged W/NiCo composite with help of neutron diffraction. The results were discussed in view of the observed microstructure and mechanical properties. The investigated bars consisted of tungsten agglomerates (bcc lattice) surrounded by NiCo-based matrix (fcc lattice). No preferential crystallographic orientation was found in the as-sintered bar. A strong texture was formed in both the tungsten agglomerates (<101> fiber texture parallel to the swaging axis) and in the NiCo-based matrix (<111> fiber texture) after rotary swaging. Although usually of double-fiber texture, the <001> fiber of the fcc structures was nearly missing in the matrix. Further, the cold-swaged bar exhibited substantially stronger texture for both phases which corresponds to the higher measured ultimate tensile strength. The residual stress differences were employed for characterization of the stress state of the bars. The largest residual stress difference (≈400 MPa) was found at the center of the bar deformed at room temperature. The hoop stresses were non-symmetrical with respect to the swaging axis, which was likely caused by the elliptical cross section of the as-sintered bar.

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Section: Discussionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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“…The total volume of the growing particles, V 3 , will thus increase from n 3 (3π/4) R 3 3 to n 1 (3π/4) R 3 1 . The volume of the remainder of the particles will decrease from n 2 (3π/4) R 3 2 to 0. The final radius, R * 3 , after stage 2: R * 3 3 = n 1 R 3 1 /n 3 .…”

Section: The Growth Of Particles With a Layer Of Alloyed Tungsten By mentioning

confidence: 99%

“…A system ideal for the study of liquid phase sintering (LPS) is tungsten heavy metal, W-Ni-Fe, which is commonly used for such studies [1][2][3]. The liquid nickel-iron-tungsten matrix shows good wettability of the solid tungsten particles and the solid phase has a high solubility in the liquid matrix.…”

mentioning

confidence: 99%

Computer simulation of solution and growth processes during the initial stage of liquid phase sintering of tungsten heavy metal

Ekbom

Antonsson

Ekbom³

2005

Scand Jof Metallurgy

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In the initial stage of liquid phase sintering, particle dissolution and growth processes occur. The melting matrix penetrates the solid particle agglomerates. A fraction of the particles dissolves in the liquid matrix phase and the original powder size will initially be reduced. At the same time the agglomerates of particles are effectively separated. In a second stage larger particles grow in equilibrium with the matrix, whilst smaller, pure particles dissolve into the matrix and the mean particle size increases. When an equilibrium is reached, the solid particles start to grow in the liquid matrix phase in accordance with the ripening process. The initial stages of liquid phase sintering have been investigated by short time sintering under microgravity and are presented in a series of micrographs. Mathematical models for the 3 stages have been developed. Computer simulations of these different stages in the solution and growth processes have been used to visualise the change in particle size distribution.

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“…In the past several decades, many preparation technologies of tungsten heavy alloys have been reported, such as spark plasma sintering and microwave sintering [4][5][6], cold rolling [7][8][9], highpressure torsion [10][11][12], rotary swaging [13][14][15][16][17][18][19][20][21][22][23], hot extrusion [24][25][26], hydrostatic extrusion [27][28][29][30]. But, many publications up to the present have shown that hydrostatic extrusion is one of the most effective processes for deformation strengthening technique for the consolidation of powder materials, especially difficult-to-deform materials, such as WHAs including W-Ni-Fe [27][28][29][30], and W-Cu series alloys [31][32].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on microstructure and mechanical properties of hot-hydrostatically extruded 93W–4.9Ni–2.1Fe alloy

Yang

Zhang

Wang

2015

Journal of Alloys and Compounds

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Tungsten heavy alloy: deformation texture and recrystallization of tungsten particles

Cited by 25 publications

References 3 publications

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Computer simulation of solution and growth processes during the initial stage of liquid phase sintering of tungsten heavy metal

Effect of heat treatment on microstructure and mechanical properties of hot-hydrostatically extruded 93W–4.9Ni–2.1Fe alloy

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