Molybdenum News Center

Deformation TZM Alloy Fracture Surface

To study TZM alloy fracture surface after deformation can better know fracture reason, property, mechanisms and other common issues, so as to understand the impact of the fracture morphology of ally on fracture process. TZM alloy fracture ways generally: along the enhanced phase particles internal fracture, along the enhanced phase particles fracture, along with enhanced phase and binding phase fracture, and along the binder phase internal fracture.

Undeformed TZM alloy fracture surface exhibits intergranular brittle fracture. In TZM molybdenum has large shares, and without deformation Mo has low bonding force, so in small strain and lower energy is prone to cracking, showing intergranular brittle fracture. On the other hand, production by powder metallurgy, there will have inevitably internal voids in the alloy, and these voids during stretching can also cause cracks and reduce the tensile strength of the alloy.

After 40% deformation, TZM alloy fracture is cleavage fracture and intergranular fracture. There are some small spherical particles on the breakage grain boundaries. After 60% deformation, alloy fracture is tensile fracture morphology. In addition, transgranular fracture ratio of alloy is increased, so that bonding area between the grains increase and strengthen interaction increases as well, making the alloy grain boundaries has been some strengthening. After 80% deformation, the alloy shows tensile fracture morphology. With the increase of deformation quantity, the internal voids quantity and size further reduce. TZM fracture morphology after 90% deformation, the fracture surface is tensile fracture deformation, and the internal voids in alloy have disappeared. We can observer platform and step morphology in fracture area, indicating the strength of the material is further improved.

• < Prev
• Next >