Multimodal grain size distribution and high hardness in fine grained tungsten fabricated by spark plasma sintering

► High applied external pressure during SPS led to high density of the samples. ► The consolidated samples by SPS had a multimodal size distribution. ► Ultrafine grains were present within the samples sintered at low temperatures. ► High Vickers hardness was obtained compared to commercial tungsten. ► The consolidated samples were proved to be pure by chemical analysis.