2008
DOI: 10.4028/www.scientific.net/msf.584-586.405
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Ultimate Strength of a Tungsten Heavy Alloy after Severe Plastic Deformation at Quasi-Static and Dynamic Loading

Abstract: Abstract. A tungsten heavy alloy (92%W, Ni-Co matrix) is subjected to severe plastic deformation (SPD) by high pressure torsion (HPT) at room temperature up to equivalent strains of 0.7, 5.3, 10.7 and 14.3. The microstructure and the mechanical properties are investigated by cylindrical compression samples at quasi-static and dynamic loading. The harder spherical W particles are homogeneously deformed within the softer matrix, becoming ellipsoidal at medium strains and banded at high strains without shear loca… Show more

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Cited by 14 publications
(4 citation statements)
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“…This disadvantage limits a prospective industrial scale-up of conventional SPD methods for THAs production. Primarily for this reason, the currently used methods of THAs fabrication are mostly based on conventional processing technologies, such as hot extrusion [19,20], cold rolling [21], and combinations of thermomechanical processing and ageing [22], although studies documenting positive effects of SPD methods on improvement of THAs performance were reported [23][24][25].…”
Section: Introductionmentioning
confidence: 99%
“…This disadvantage limits a prospective industrial scale-up of conventional SPD methods for THAs production. Primarily for this reason, the currently used methods of THAs fabrication are mostly based on conventional processing technologies, such as hot extrusion [19,20], cold rolling [21], and combinations of thermomechanical processing and ageing [22], although studies documenting positive effects of SPD methods on improvement of THAs performance were reported [23][24][25].…”
Section: Introductionmentioning
confidence: 99%
“…Up to now, only few studies investigated the direct temperature dependent deformation behavior of bcc-metals on a macroscopic [3][4][5][6]10] or local scale [1][2]9,11], especially in terms of SRS, by changing the homologous testing temperature.…”
mentioning
confidence: 99%
“…The formation of the subgrains in the tungsten phase is considered to be caused by work hardening during hot-hydrostatic extrusion process. Because the extrusion temperature used in the present study, 1200°C, is much lower than the recrystallization temperature of the powder metallurgy produced tungsten, which was reported to be as high as 1650-1800°C [12][13][14]. Thus, the subgrains of 93W alloy get smaller and its strength increases markedly duo to the small subgrain size and work hardening.…”
Section: Microstructurementioning
confidence: 82%
“…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%