TZM Alloy Mechanical Property Influence Factors

There are many influence factors affecting TZM alloy's mechanical property, including production method, deformation processing, annealing temperature and neutron radiation treatment.

Using different production method to produce TZM alloy the mechanical property of alloy is vary. Using arc melting method and powder metallurgy method to produce TZM alloy the high temperature property and mechanical property has great improved, which is better than pure molybdenum’s. When the temperature is lower than 1000 ℃, the performance of the two methods obtained TZM sheet is considerably, but using arc melting method obtained TZM bars strength is better than powder metallurgy obtained. When the temperature is higher than 1200 ℃, powder metallurgy method produced TZM plates and bars performance is equivalent, but they poorer than using arc melting method produced.

TZM alloy after hot-forging and extrusion process, the elongation at room temperature up to 33%. Compared with the un-deformation TZM alloy the elongation has been greatly improved, indicating that proper treatment can improve the plastic deformation of the alloy. In addition, the annealing process can also affect the mechanical property and structure of the alloy. As the annealing temperature increase, TZM alloy’s hardness and tensile strength decreased, plastic increased. TZM alloy after neutron irradiation, strength and hardness significantly increased, while the elongation decreased sharply, but fracture toughness decreases to a lesser extent.

In addition, the strain rate has a greater influence on the TZM alloy’s mechanical property. At 400 ℃, the tensile strength of the alloy substantially does not vary with strain rate changes. At room temperature and 1000 ℃, the strength of the alloy with the change of strain rate were increased 30% and 20% separately. At 1200 ℃, the strain rate increases, the intensity of TZM alloy is increased 80%. At 1400 ℃, the strength of the alloy increased from 20MPa to 135MPa. It is shows that when the temperature is below 1000 ℃, strain rate has little effect on the alloy ‘s strength. When the temperature is higher than 1200 ℃, with temperature increasing, strain rate influence on the strength is more obvious.

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