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Comparison of TZM alloy and pure molybdenum

Pure molybdenum has excellent properties such as high melting point, low thermal expansion coefficient, good electrical and thermal conductivity, excellent thermal shock resistance and thermal fatigue properties. However, molybdenum has the disadvantages of low recrystallization temperature, high brittleness and low strength, so its application is greatly limited. Titanium-zirconium-molybdenum alloy (TZM alloy) is currently the most widely used molybdenum alloy. On the basis of molybdenum, a small amount of titanium and zirconium elements are doped to improve the mechanical properties and recrystallization temperature of molybdenum.

Metallographic structure: Comparing the metallographic structures of TZM and molybdenum, it is found that the grain size of TZM sintered blank is smaller, about 30um, while the grain size of molybdenum sintered blank is about 40um.

Mechanical properties: The room temperature tensile strength of TZM molybdenum alloy is significantly higher than that of pure molybdenum, but the elongation is smaller than that of molybdenum. At a high temperature of 1200°C, the tensile strength of molybdenum decreases significantly, but TZM remains at a high level.

Recrystallization temperature: The initial recrystallization temperature of titanium-zirconium-molybdenum alloy is about 1350°C, and the recrystallization temperature is 1700°C. The starting recrystallization temperature of molybdenum is about 850°C, and the end recrystallization temperature is about 1250°C.

Tensile fracture morphology: TZM room temperature tensile fracture consists of a series of small fractures, which are basically cleavage fractures with low elongation. The room temperature tensile fracture of molybdenum is composed of a series of interconnected small dimples and has a high elongation rate. At 1200°C, the fracture morphology of TZM changed, with many dimples appearing, showing cleavage fracture and good plastic deformation. The high-temperature fracture morphology of Mo shows a herringbone ridge pattern, with obvious dimples, showing ductile deformation and high elongation.