Effects of powder mixing technique and tungsten powder size on the properties of tungsten heavy alloys

Densification behavior of nanocrystalline W–Ni–Fe composite powders prepared by sol-spray drying and hydrogen reduction process

“…Due to the absence of the heat treatment to remove the residual hydrogen after the sintering, the mechanical properties of the alloys in the present study are relatively lower than those of the conventional WHAs with the similar compositions, as shown in some literatures [25,26]. However, the mechanical properties (950 MPa in tensile strength and 12% in elongation) are still impressive since the sintered compacts are not soaked in an inert atmosphere to eliminate the "hydrogen brittleness".…”

Thermodynamic analysis and effect of temperature on surface hardening of tungsten heavy alloys using ethanol

“…The amount of liquid phase in the alloy was determined to be $15 vol.%. The details of the sample preparation techniques and properties of the as-sintered alloy were given elsewhere [7]. Surface modification of the coupons was carried in the atmosphere having Ar/C 2 H 5 OH molar ratio of 12.7 at 1200, 1300, 1400 and 1500 K for 60 min.…”

Microstructure and mechanical properties of tungsten heavy alloys

“…Since the micro-hardness of the W grains in WNF and WNCs is similar, and the micro-hardness of the matrix phase in WNF is only slightly higher than that in WNC (Table 2), the vastly higher tensile strength of the WNF as compared to that of WNCs and the transgranular cleavage fracture in WNF possibly originated from finer W-grain size and better W/matrix phase cohesion and lesser contiguity (0.33) in WNF alloy as compared to those of WNC alloys. The other reported values [2,[17][18][19] of microstructural parameters such as contiguity, W-grain size and mechanical properties are listed in Table 2 for comparison. The difference in contiguity between this study and literature is due to clustering of tungsten grains [1].…”