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TZM Alloy and Other Molybdenum Alloys

Pure molybdenum room temperature brittle and cold-brittle transition temperature is high, which greatly limits its processing and applications. In order to expand the application range of molybdenum material, manufacturers usually add a small amount of alloying elements into molybdenum to obtain molybdenum alloy. Molybdenum alloy not only improves the toughness of molybdenum and reduce its plastic-brittle transition temperature, but also can expand its application range. Molybdenum alloys can be classified by strengthening type and alloying elements. The following mainly describes the classification by alloying elements, which is binary molybdenum alloy, multi-element molybdenum alloy, doped molybdenum alloys, rare earth molybdenum alloy and so on.

Binary molybdenum alloy means adding single alloy elements into molybdenum to form molybdenum alloy. Adding tungsten and rhenium in molybdenum, this molybdenum alloy has large alloying elements added quantity and the hardness and heat resistant of alloys is excellent. The molybdenum alloy which added with titanium, zirconium, hafnium and other alloy elements has small alloying elements adding quantity.

Multi-element molybdenum alloy, there are two or more alloying elements added into molybdenum. Multi-element molybdenum alloy has a variety of categories, such as Mo-Ti-Zr-C series, which is an alloy added with a certain amount of zirconium and carbon on the basis of Mo-0.5Ti, including TZC and TZM. Mo-W-Hf-C series and the Mo-W-Hf-Zr-C series have good overall performance, but the preparation process is not mature, including M₂₅WH₁, M₂₅WH, H₂WM₂₅, and M₂₅WZH₁ and so on. Mo-Hf-Zr-O series according to different hafnium doping quantity are divided into different type, including ZHM, ZHM₄, ZHM₇, and ZHM₈.

Doped molybdenum alloy usually doped silicon, aluminum, potassium and other trace elements into molybdenum, which has better high temperature properties. Recrystallization temperature of this it can reach 1750 ℃, and after recrystallization it has some strength and ductility.

Rare earth molybdenum alloy has stable chemical structure and good strengthening effect, which has wide application range.

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