Study of the structure and mechanical properties of nano- and ultradispersed mechanically activated heavy tungsten alloys

Recent Progress in Processing of Tungsten Heavy Alloys

“…It simultaneously applies an electric current along with mechanical pressure in order to consolidate powders or synthesize and simultaneously densify specific products. However, the SPS technology has been successfully used to prepare WHAs within limited numbers [102][103][104][105][106][107][108]. Almost full densification is attained at 1250 ∘ C to produce fine-grained Journal of Powder Technology 7 90W-7Ni-3Fe heavy alloys with W grain sizes of less than 5 m. During heating, the hardness of the alloy tends to first rise, reaching the maximum value of 72.2 HRA at 1100 ∘ C, and then goes down.…”

“…The microstructure and processing factors of the heavy alloys are the key to affect their mechanical properties. For WHAs, the main influencing factors of mechanical properties include compositions [27-33, 36-39, 83], processing type [71-73, 85, 95, 99, 103, 122, 132, 133] and temperature/time [41,43,62,76,86,97,104,105,134], tungsten grain size and shape effect [47,81,87,118], grain growth [46,82,110,112,117], interface bonding between W and matrix [80,90,114,130,131], and porosity and pore size distribution [49,83,118,124,125,127].…”

“…Several W-Ni-Fe alloys using compressing Kolsky test at high strain rates for dynamic deformations involving large plastic strains, the response of the WHAs, are controlled by the behavior of W grains [137]. The overall mechanical properties can be improved when the W particles are of fine size and the interfacial area between W particles is reduced [104]. However, penetrators that have too high strength are easily embrittled, and, thus, their penetration performance deteriorates because of fragmentation during penetration.…”

Structure and properties of advanced materials obtained by Spark Plasma Sintering

“…The pressing pressure did not exceed 100 MPa. Table 3 Mechanical properties of conventional W-Ni-Fe alloys [33][34][35] and the W-Ni-Fe alloy that was fabricated using the SPS method [36]. As observed from the presented data, the consolidation optimization in the SPS process allows one to obtain Al 2 O 3 -based high-density ceramics with a homogeneous microstructure and improved physical and mechanical properties (Fig.…”

Impact Properties of Metal-Ceramic Alloys Based on Tungsten-Nickel-Iron-Cobalt System at High-Speed Interaction

“…Under their physical-mechanical characteristics, the impactors made of them show themselves to the best advantage than the others: they have high hardness, higher yield stress and shear modulus etc. [1,2] In [3], some features of obtaining alloys of the tungsten-nickel-iron-cobalt (TNIC-90) system by liquid-phase sintering of powder preparations have been investigated. By varying the initial porosity of the powder preparations, samples of highly porous composites have been obtained.…”