Titanium Zirconium Molybdenum(TZM Alloy)

What is Titanium Zirconium Molybdenum(TZM Alloy)?

TZM alloy is an alloy of 0.50% Titanium, 0.08% Zirconium and 0.02% Carbon with the balance Molybdenum. TZM alloy is manufactured by either P/M or Arc Cast technologies and is of great utility due to its high strength/high temperature applications, especially above 2000'F.

TZM alloy has a higher recrystallization temperature, higher strength, hardness and good ductility at room and elevated temperatures than unalloyed Molybdenum. In addition, TZM exhibits good thermal conductivity, low vapor pressure, good corrosion resistance and is machinable.

TZM Molybdenum has a higher recrystallization temperature, higher strength, hardness and good ductility at room and elevated temperatures than unalloyed Molybdenum. TZM offers twice the strength of pure moly at temperatures over 1300'C. The recrystallization temperature of TZM is approximately 250'C higher than moly and it offers better weldability. In addition, TZM exhibits good thermal conductivity, low vapor pressure, and good corrosion resistance and is machinable.

TZM alloy costs approximately 25% more than pure molybdenum and costs only about 5-10% more to machine. For high strength applications such as rocket nozzles, furnace structural components, and forging dies, it can be well worth the cost differential.

TZM plate image

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Improving titanium-zirconium-molybdenum performance

Titanium zirconium molybdenum (TZM) has many good performances, and it is often used as high temperature structural components. However, it also has some drawbacks that it be limited in application. And improve the performance of titanium zirconium molybdenum methods have two which are to improve its oxidation resistance and the using neutron irradiation method.
Firstly, TZM oxidation resistance is not very good, it can not generate anti-oxidation layer to protect itself, and it will limit the range of applications and service life. Improve TZM antioxidant properties there are two main methods. The first is alloyed, which is adding trace elements in the alloy to improve oxidation resistance of the TZM, but this method of alloying at a high temperature oxidation is not strong resistance. The second method is coating surface technique in which coated a protective layer in the surface of the alloy. And the pack cementation method because it has a low cost, easy to control, substrate and coating adhesion is widely used.
On the other hand, after further research found that using neutron radiation method can change TZM ductile-brittle transition temperature and mechanical properties, thereby improving the performance of TZM.