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How to strengthen molybdenum and molybdenum alloys?

The strengthening methods of molybdenum are microalloying, carbide strengthening, solution strengthening and dispersion strengthening. The specific analysis is as follows: Trace alloying is mainly to add trace Ti, Zr, B, La and other alloying elements, the addition amount of 0.1%~1% for solid solution strengthening. Trace amount of Zr and Hf has the greatest effect on increasing the high temperature hardness of molybdenum, while Zr, Hf and Ti have a significant effect on increasing the recrystallization temperature of molybdenum. Such a small amount of alloying elements can significantly improve the performance. In addition to refining grains, removing or weakening harmful effects such as C, O2 and N2 and improving the processing and welding performance, it is also due to dislocation and the existence of elastic stress field around impurities. When a small amount of solute element is added, it places the maximum dislocation accumulation area of the solid solution. As a result, the elastic stress is reduced and the internal energy of the metal is reduced. The internal energy of the micro-alloyed alloy is less than that of the pure metal, and more energy is needed to destroy the elastic equilibrium of the alloy. In addition, heterogeneous atom stacking is formed around the dislocation, which makes it difficult for the dislocation to migrate, so the recrystallization temperature of the alloy increases. The best content of titanium and zirconium is about 0.5% and 0.2% respectively. The strengthening effect of zirconium is better than that of titanium.
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