Spreading of Ni-Fe-W melts on polycrystalline tungsten

Effect of heating mode and sintering temperature on the consolidation of 90W–7Ni–3Fe alloys

“…It is well known that due to faster diffusion rate and capillaryinduced stresses the densification kinetics is higher during liquid phase sintered compacts [37]. The densification response of the alloys in the present study (Fig.…”

“…5b) confirms that they are in accordance with this. Another factor that contributes to densification during liquid phase sintering is that the newly formed wetting melt spreads to fill the small pores and preferentially penetrates the grain boundaries [37,38]. Since tungsten has substantial solubility into the Ni-Fe matrix, hence the melt tends to dissolve the interparticle necks and spreads out [39], this results in the decrease of the solid-liquid interfacial energy below that of the equilibrium value [40] and further contributes to densification in the initial period just after melt formation.…”