La2O3 Influence TZM Alloy’s Mechanical Properties

La2O3 particles can not only improve the recrystallization temperature of TZM alloy, but also can improve strength, elongation and other mechanical properties. The strengthen role of the La2O3 particles is mainly due La2O3 particles and dislocations can occurs strong interaction. There are a large number of dislocations in TZM alloy are firmly pinned by La2O3 particles. If dislocation wants to break the pinning of particle should generate greater stress, thus room temperature tensile strength of TZM-La2O3 alloy is better than TZM alloy which has significantly improved. With the La2O3 particle content increase, the interaction between particles and the dislocation enhance and pinning effect to dislocation is also significantly enhanced. Strengthening role of La2O3 particles become more pronounced.

TZM alloy after adding La2O3 particles exhibit good ductility, mainly because of a microporous relaxation mechanism of La2O3. When introduced the small dispersed second phase La2O3 particles in into Mo, on one hand, it makes deformation more uniform. On the other hand, a large number of dislocations are nailed it, in favor of delaying the formation of intergranular cracks. With the further deepening of deformation, cracks will expand or stretch into the cavity, and these holes allow stress relaxation, thereby increasing the tensile properties of the alloy.