Effects of vanadium concentration on the densification, microstructures and mechanical properties of tungsten vanadium alloys

Influence of vanadium precursor powder size on microstructures and properties of W–V alloy

“…5 shows EDS analyses of the black cluster, which clearly indicate that the regions with black clusters of W5Vm are V enriched phases. The results of our previously published article also proved that these dark black clusters are V enriched particles [13]. Fig.…”

“…Muñoz et al [12] developed different grades of W-V alloys from mechanical alloying route with a ball-powder ratio of 4:3 for 10 h and subsequently sintered by hot isostatic pressing (HIP) with an average V powder size of 20 μm. The result of microstructure analysis has shown V pools present in W-V and W-V-La 2 O 3 , which suggests that their present milling conditions are not able to promote the perfect dissolution of V in W. Our previous studies [13,14] also report that it is rather difficult to reduce its powder size by milling conditions since V possesses high ductility. In most previous studies a larger V precursor powder of micron size has been used [9,12,15,16].…”

“…Apparently the influence of V precursor size does not seem to contribute a large difference to the bending strength of sintered samples as the bending strength of W5Vs is just 15% higher than W5Vm, and the bending strength of W based materials at room temperature does seem to be dependent on its density [13]. Normally, the materials with higher density have higher compression strength [18].…”

Development of tungsten-based materials by different sintering techniques

“…The porosity level of different sintered W-V materials was estimated from the measured density by the Archimedes' method and the theoretical calculated density [16]. Vicker's micro-hardness values of well polished bulk samples were measured at room temperature by applying a load of 1.96 N for 10 s. The micro-hardness value of each sample was determined by averaging 8-10 different indents.…”

“…An alternative approach is the addition of small amounts of doping elements, such as V, Ti, Y, La 2 O 3 , and Y 2 O 3 , to activate sintering of W powder and thus to achieve good density [12][13][14][15]. Our recent studies suggest that the addition of V in W constrains the grain growth and improves the densification and mechanical properties [12,16]. V addition enhances the thermal stability of the microstructures and mechanical properties of W-based materials [17].…”