What is TZM 

TZM alloy is a popular molybdenum-based alloy containing ±0.08% zirconium, ±0.5% titanium, ±0.03% carbon and molybdenum makes up the balance. Titanium zirconium molybdenum alloy is short for TZM which the initials of these three elements is. The strength of TZM is two times that of pure Molybdenum when the temperature reaches 1300 degrees Celsius. By combining small amounts of Ti and Zi, TZM moly alloy gains a high recrystallization temperature and consequently yields a higher strength in high temperature. The optimal doping percentages are 0.4 – 0.6% of Titanium, 0.07- 0.12% of zirconium and 0.01-0.04% of carbon.

TZM Rod

Diameter0.029″ (0.75mm) – 5″ (127 mm)
Length0.15″ (3.81mm) – 48″ (1020mm)

TZM Plate

Thickness0.240”(6 mm) to 3.15”(80 mm)
WidthMaximum 22″ (558mm)
LengthMaximum 80″ (2000mm)

TZM Sheet

Thickness0.004″ (0.1 mm) to 0.240″ (6 mm)
WidthMaximum 26″ (660mm)
LengthMaximum 80″ (2000mm)
SurfaceGround, Chemical Cleaned, As rolled
CompositionTi 0.5 %, Zr 0.08%, C 0.03%, Mo Balance
StandardASTM B386 ASTM B387

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As an ISO certified TZM molybdenum products manufacturer, We are capable of offering various types of TZM molybdenum rods, plates and sheets that all meet a consistently high standard that conforms to ASTM B386 and ASTM B387. We have the capacity to provide a fast lead time and handle large-volume contracts.  Download PRODUCT CATALOG to learn more about our Molybdenum products.

TZM Alloy Applications

TZM alloy is an attractive material for uses in the high strength, high temperature and vacuum reliant industries such as aerospace, electronics, and thermal treatment. Molybdenum TZM alloy ideally serves these industries especially when a working temperature range needs to be between 700 and 1400°C.

For example, high temperature TZM is a popular molybdenum-based alloy utilized in the furnace and in heat-treating structural components such as shielding and supporting parts. This is because it has a high creep resistance. What is more, TZM molybdenum alloy is extremely suitable to make high temperature and high strength TZM moly forging dies for isothermal forging, non-ferrous and ferrous metals casting and Molybdenum TZM piercing plugs. In addition, TZM alloy is an excellent choice as a weldable and high-recrystallization temperature material used to produce Molybdenum TZM rocket nozzle and TZM hot gas valve for the aerospace application.

 

TZM Alloy Properties

  • Creep Resistance
  • High Tensile Strength
  • Good Machinability
  • High Recrystallization Temperature
  • Corrosion Resistance
  • Good Weldability

TZM alloy possesses a variety of valuable properties, such as high strength, creep resistance, hardness, and low vapor pressure in high temperature environments. Additionally, it has a low coefficient of expansion, excellent resistance to heat and corrosion and good machinability. Compared with the pure molybdenum, TZM alloy has a more stable crystalline structure and a higher recrystallization temperature. This is due to the small amount of zirconium and titanium doped into the molybdenum substrate. In addition,  the composite carbides Mo2C, TiC and  ZrC with the extremely fine size refine and restrain the crystalline grain of molybdenum and consequently helps Molybdenum TZM material become more weldable and creep resistant than pure molybdenum.

 

TZM Molybdenum Mechanical and Physical Properties

TZM Molybdenum Physical Properties

TZM Molybdenum Mechanical Properties

Density0.37 lb/in3
10.22 gm/cm3
Tensile Strength110 (760) ksi (Mpa)-RT
Melting Point4753 °F
2623 °C
Elongation15% in 1.0″.
Thermal Conductivity0.48 Cal/cm2/cm°C/secHardness220 dph
Specific Heat0.073 Cal/gm/°C
Coefficient of Linear Thermal Expansion2.50 micro-in/°F x 10-6
5.20 micro-in/°C x 10-6
Modules of Elasticity46000 ksi
320 gpa
Electrical Resistance6.85 micro-ohm-cm

The two typical methods of manufacturing TZM Molybdenum are powder metallurgy and vacuum arc-casting processes, following which occurs a series of drawing, forging, rolling and other deformations. The working temperature of the deformations needs either below 1300℃ or above 1650℃ in order to avoid being affected by hot brittleness.

 

Precise Controlled Mixing and Sintering

We take lots of efforts to ensure the powders of Mixed Mo, Zr and Ti have the best purity and particle sizes. We also put lot emphasis on the control of heating temperature and content of oxygen and hydrogen during the vacuum sintering. Therefore, the TZM materials fabricated at CHEMETAL USA always obtain a fine and homogenous microstructure and highly performed properties. These precise quantity controls effectively limit occurrence of cracking, loosen structure, and porosity caused by outgassing. Besides that, the thermal shock fatigue resistance and the carbide strengthening effect can also be guaranteed at the theoretical level.

 

Accurate Thermal Forming

TZM materials are very hard to be formed and mechanized since it has a high ductile to brittle transition temperature. It is brittle at even at room temperature. Therefore, TZM forming process has to follow a series of accurate treatments. The TZM plat and sheet need to be washed by alkaline detergent after every time of rolling. The stress released annealing is also a critical process that is necessary to operate by multiple times at certain rolling steps. The forging and extruding for producing TZM rods are also needed to be tightly controlled in the aspects of forming rate and pressing temperature.

 

TZM Alloy Composition

ELEMENTCONTENT%
Ti0.4-0.6
Zr0.07-0.12
C0.01-0.04
S≤ 0.006
Fe≤ 0.01
Ni≤ 0.005
N≤ 0.003
MoBalance

 

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