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TZM alloy properties

TZM alloy has many excellent physical and chemical properties similar to molybdenum, including melting point, high strength, high elastic modulus, low linear expansion coefficient, low vapor pressure, good thermal and electrical conductivity, good corrosion resistance and good High temperature mechanical properties, so it is widely used in various fields as high temperature parts.

However, compared with TZM alloys, molybdenum has lower recrystallization temperature and strength and is more brittle, so the application range of molybdenum is limited. TZM alloy is based on Mo matrix with small amounts of Zr, Ti and C elements added. These finely divided particles prevent the possibility of molybdenum grain growth at high temperatures. This increases the recrystallization temperature of the alloy and greatly improves the properties of the alloy.

Room temperature and high temperature tensile mechanical properties of TZM alloy: The room temperature tensile strength of TZM alloy is significantly higher than that of molybdenum, but the elongation of TZM alloy is not as good as that of molybdenum. Experiments show that at 1200°C, the tensile strength of molybdenum has dropped significantly, but the tensile strength of TZM alloy remains at a high level. This is mainly because the second phase strengthening of TZM alloy hinders dislocation movement, resulting in an increase in the strength of the alloy. Furthermore, these dispersed second phases can affect dislocation motion, resulting in reduced deformability and plasticity.

TZM alloy recrystallization temperature: The recrystallization temperature of molybdenum is about 850°C, and the recrystallization temperature of TZM alloy is about 1350°C. TZM alloy has a high recrystallization temperature, so the performance of TZM alloy continues to improve and its application range continues to expand. TZM alloy has a higher recrystallization temperature, mainly because the second phase particles have a strong pinning effect on dislocations and sub-grain boundaries, making the substructure stable. During the recrystallization recovery process, it will hinder dislocation movement and sub-grain boundary merging, maintain a high dislocation density, delay the formation of recrystallization nuclei, and thereby increase the recrystallization temperature.

High-temperature oxidation resistance of TZM alloy: TZM has good high-temperature mechanical properties, allowing it to be widely used in many fields as a high-temperature material. However, TZM alloy has poor high-temperature oxidation resistance and cannot form an antioxidant layer to protect it at high temperatures. Therefore, it oxidizes quickly at high temperatures and has a short service life. In order to improve the high-temperature oxidation resistance of alloys, there are two main methods: alloying and coating.

High temperature bending and creep properties of TZM alloy: Compared with molybdenum, TZM alloy shows excellent bending resistance, but the higher the temperature, the worse its bending resistance. The creep properties and stress strength of TZM alloys are closely related to temperature. As the cyclic stress range increases, cyclic creep becomes more serious. Within the same cyclic stress range, temperature has a greater impact on cyclic creep. As the temperature increases, cyclic creep becomes more obvious.

High-temperature fatigue properties of TZM alloy: Research has found that as the maximum cyclic stress increases, the high-temperature fatigue life continues to shorten and the elongation at break increases.