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New Type Rare Earth Doped TZM Alloy

The experiment found that doping rare earth into molybdenum can refined molybdenum grains. Besides, rare earth molybdenum alloy not only has lower plastic-brittle transition temperature, but it can improve some molybdenum properties, such as increasing molybdenum recrystallization temperature and high temperature strength, improving toughness plasticity property and high temperature creep property. As we know, TZM alloy has high melting point, high strength, high elastic modulus, low expansion coefficient, low vapor pressure, good electrical and thermal conductivity, good corrosion resistance and other good properties. It is the one of most widely used alloy in molybdenum alloy. To make TZM alloy can be applied to more areas, some scholars to prepare a new type rare earth doped TZM alloy, thereby improving ductility and toughness properties of TZM alloy.

Common doped rare earth elements including La, Y, Ce, production method usually uses powder metallurgy method and vacuum arc melting method. Using powder metallurgy method to produce rare earth doped TZM alloy the production processes are as following: mixed powder, ball milling, cold isostatic pressing, sintered, cogging, hot-rolled, cold-rolled and alkali wash and other subsequent processing steps then to obtain the finished product. Taking La₂O₃ doped for example, observing the La₂O₃-TZM alloy found TZM alloy’s crystallization temperature is increased. Undoped TZM alloy recrystallization temperature is about 1100 ℃ and La₂O₃-TZM alloy recrystallization temperature is about 1200 ℃. Further, at the same temperature, La₂O₃-TZM alloy has smaller grains than TZM alloy. Besides, after complete crystallization, the grain size of La₂O₃-TZM alloy is also smaller than TZM alloy.

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