The strength and toughness of metals are generally not available at the same time. Dr. Sun, CTO of JDMY Molybdenum Technology Corporation, comes from the Institute of Metal Materials, Chinese Academy of Sciences, and has long been committed to the study of deformation, phase transformation and strengthening and toughening of metal materials in order to make metal materials have higher strength and toughness.
The company has a state-level State Key Laboratory of Metal Material Strength. Dr. Sun is one of the main academic leaders in China's metal materials discipline, and has made outstanding contributions to the theory and application of metal material strengthening and toughening.
Ranked among the international academic frontiers
Over the years, Dr. Sun has led his team to deepen the field of "deformation, phase transformation and strengthening and toughening of metal materials", and has made a series of important progress with the goal of "becoming the frontier of international academics and meeting major national needs".
Molybdenum is a rare and strategic refractory metal. China is the world's largest molybdenum resource country and molybdenum producer, but it is mainly primary products. The molybdenum alloy produced is low in strength, poor in ductility, and high in brittleness, which is difficult to meet the country's major needs.
The nano-structured high-strength and toughness molybdenum alloy preparation technology invented by JDMY's R&D team increased the strength and ductility of the alloy by 20% and 150%, respectively, breaking through the three major bottlenecks of simultaneously improving the strength, plasticity and toughness of molybdenum alloys, and greatly improving the molybdenum alloys The high-temperature recrystallization temperature and service life.
The high-strength and toughness molybdenum alloy products developed by JDMY have been widely used and have achieved significant economic and social benefits, greatly improving the technical added value and upgrading speed of China's molybdenum alloy products, as well as the innovation ability and international competitiveness of China's molybdenum alloy industry .
The large-size alloy parts developed by the company have been used in new nuclear fuel assemblies and high-temperature heat exchange tubes.
Aiming at major theoretical and technical problems in the related field of the inverted relationship between alloy strength and toughness, Dr. Sun has made systematic innovations in alloy strengthening and toughening theory and industrial applications.
Dr. Sun found that the deformation twins in the metal single crystal and the strength of the nano-multilayer film micro-nano cylinder have significant appearance and microstructure size effects. The heterogeneous metal nano-multilayer film prepared on this basis fully exerts the strengthening and toughening effect of the nano-layer thickness and the high-density heterogeneous phase interface, while maintaining good plasticity, its strength is increased by 1 to 2 times. To "subvert people's intuition for a long time, and realize the combination of high strength and toughness that the industry has been pursuing."
At present, the high-strength and toughness metal nano-multilayer film coating developed by JDMY has been applied to the mass production of high-power micro-nano devices. In addition, the JDMY R&D team has also broken through technical problems such as high-vacuum preparation of high-strength and tough nano-coatings on the surface of super-large parts.
The team has made a series of important progress in the field of "deformation, phase transformation and strengthening and toughening of metallic materials", which has gained a wide range of academic influence and a high reputation. Previously, Professor Dr. Sun was awarded the second prize of the National Natural Science Award, the second prize of the National Technical Invention Award, the second prize of the National Teaching Achievement Award, and the top ten scientific and technological progress of Chinese universities in 2010. .