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Molybdenum dynamics

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2018/11/21 10:50
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  Molybdenum is widely used in the production of various types of steel materials such as stainless steel. Molybdenum alloys have broad application prospects in aerospace, machinery, metallurgy and other fields due to their excellent thermal conductivity and high temperature resistance. However, due to the low temperature brittleness, low strength and poor ductility of molybdenum, deep processing of molybdenum alloy is difficult, and its application is greatly limited. For many years, China's molybdenum industry mainly produces primary products of molybdenum. Therefore, the development of molybdenum alloy materials with better performance and higher added value is of great significance to the development of China's molybdenum industry . Starting from the actual needs of the project, Sun Jun's research team traces back to the difficulties in material preparation technology, reveals the characteristics and mechanism of grain size and grain size and grain boundary particle strengthening and toughening in rare earth oxide doped molybdenum alloy, and establishes toughness. The quantitative analytical model is proposed, and a new idea of ​​nano-doping strengthening and toughening is proposed. On this basis, the researchers developed a key technology for the preparation of nano-rare earth oxide molybdenum alloys by liquid-phase doping with molecular grade doping, which solved the nanocrystallization and non-agglomeration of rare earth oxides, and the interior and grain boundaries of molybdenum grains. The uniform dispersion distribution and the high temperature stability of the nano-superfine crystal structure and other three key problems that restrict the development of the field. The strength and elongation and toughness of the molybdenum alloys they produced exceeded the best level of similar materials reported by the world's leading companies, while the plastic-brittle transition temperature was significantly reduced. The high temperature recrystallization temperature, high temperature strength and tensile ductility of the alloy were significantly improved. It is reported that the relevant technology has achieved industrial scale application, and the project has also won the first prize of the 2012 Ministry of Education Technology Invention Award.

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