[en] This patent describes a process for producing consolidated bodies of tungsten heavy metal having the lower grain sizes. It comprises: forming a relatively uniform blend of elemental metal powders, wherein the blend consists essentially of from about 88% to about 98% by weight of tungsten, from abut 0.25% to abut 1.5% by weight of a grain size reducing additive selected from the group consisting of ruthenium, rhenium and mixtures thereof, balance iron and nickel in a weight ratio of nickel to iron of from about 1:1 to about 9:1, pressing the powder to form a green body, sintering the green body in a reducing atmosphere for a time sufficient to achieve near theoretical density and liquid phase sintering for a time sufficient to achieve near theoretical density