TZM is the name applied to a particle-strengthened molybdenum alloy containing titanium, zirconium and carbon. Fine dispersed titanium-carbides are responsible for the excellent strength properties at temperatures up to 1400 ^oC. Some advantages of TZM compared to pure molybdenum include; above 1100 ^oC its tensile strength is about twice that of unalloyed molybdenum, TZM has better creep resistance, a higher recrystallization temperature and better welding properties. TZM should be considered for all structural parts operating over 1100 ^oC under conditions where unalloyed molybdenum is normally used. TZM can be fabricated in much the same manner as unalloyed molybdenum. 

The recrystallization temperature of TZM is higher than that of unalloyed molybdenum. However, TZM, like unalloyed molybdenum does become brittle when recrystallized. The room temperature tensile strength of recrystallized TZM is about the same as unalloyed molybdenum.

Nominal Composition in Percent:

              Ti                          0.5

              Zr                         0.08

              C                          0.02

              Mo                       Balance

Density: 10.16 g/cc at 20 ^oC

Recrystallization Temperature: 1425 to 1595 ^oC

Stress-Relief Temperature: 1 hour at 1095 to 1260 ^oC

Liquidus Temperature: 2620 ^oC

Coefficient of Linear Expansion: 4.9 μm/m ⋅ K at 20 to 40 ^oC

Elastic Modulus: Tension, 315 GPa (46 × 10⁶ psi) at 20 ^oC;

                         205 GPa (30 × 10⁶ psi) at 1095 ^oC

Typical Tensile Properties of TZM:

                                                                                             Yield Strength         Elongation

Temperature                          Tensile Strength               at 0.2% Offset         in 50 mm

^oC                                               MPa           ksi                   MPa              ksi             %

Stress-Relieved Condition:

20                                     965            140              860            125          10

1095                                  490             71               435             63           --

1650                                   83              12               62                9           --

Recrystallized Material:

20                                     550              80               380              55          20

1095                                  505              73                --               --           --

1315                                  369             53.5               --               --          --