The mechanical properties of 90%W-4%Mo-4%Ni-2%Fe sintered alloys were studied in this experiment.
The specimen which was not sufficiently reduced in the heating process before the rapid densification which occurred by the liquid generation (above 1453°C), showed inferior mechanical properties even if the sintering time was prolonged. It was considered that the deterioration of the mechanical properties was caused by the lowering of the boundary strength owing to the segregation of oxygen. The mechanical properties of the specimen which was sufficiently reduced and sintered, were much improved by the heat treatment. For example, mechanical properties of the specimen heated up at about 6.3°C, /min, sintered at 1500°Cfor 90 min in H₂ and then quenched after keeping for 60 min at 1000°Cin N₂ were as follows; the tensile strength is 96.7 kgf/mm₂ and the elongation is 20.4%.