Pure Molybdenum possesses a unique combination of physical properties including excellent hightemperature strength, high corrosion resistance except oxidation resistance, high thermal conductivity, a high elastic modulus and a low thermal-expansion coefficient. Because of these outstanding properties,technically pure Molybdenum is used in a wide range of applications, including lighting-technology, highPrimig,Highly deformed Molybdenum is ductile at roomtemperature,but recrystallization leads to room-temperature embrittlement, which is not an intrinsic property of Molybdenum itself, but is caused by the presence of interstitial impurities. Because of its high melting point (2620°C), Molybdenum is nowadays mostly produced by powder metallurgical procedures. During the last decades, the amount of these interstitial impurities in the raw material has been reduced significantly. At the same time, the properties of technically pure Molybdenum have changed by adapting the PM production process to the latest technological standards. The recrystallization behavior of Molybdenum, which is strongly influenced by the process parameters of the thermo-mechanical treatment and the purity of the material, is decisive for the resulting mechanical properties, for example ductility, hardness, strength and toughness.Therefore, a recrystallization diagram is essential for the prediction of the recrystallized grain size and to gain knowledge about how the recrystallization temperature depends on the degree of deformation.
The findings of the present study are discussed in comparison with Pink’s recrystallization diagram.