Yang Ke, a researcher at the Institute of metals, Chinese Academy of Sciences, has been engaged in the basic and Application Research of new medical metal materials for a long time. Recently, team members Ren Ling, Wang Hai and others have obtained ultra-fine grained Cu Ti alloy with excellent performance and high thermal stability through the microstructure design idea of "dual phase shell wrapping ultra-fine equiaxed grain". Recently, relevant research results were published online in 《nature - communication》
It is understood that compared with titanium alloys with conventional grain size (5-10 microns), ultrafine grained titanium alloys not only have higher strength and good plasticity matching, but also have higher wear resistance and better biocompatibility. They are very attractive in many important applications such as aerospace, biomedicine and so on.
However, the preparation and processing of ultrafine grained titanium alloys are extremely difficult, and the thermal stability of the microstructure is poor. These two bottlenecks restrict the development and application of ultrafine grained titanium alloys.
In recent years, Yang Ke's team has been committed to the integrated research and application of structure and biological function of copper containing titanium alloys. On the basis of the previous research work, the team proposed the preparation strategy of "eutectoid element alloying quenching hot deformation" (eqd) for ultra-fine grained Cu Ti alloy, and realized the design idea of microstructure of ultra-fine equiaxed grain wrapped by dual phase shell.
The research team improved the thermal stability of the microstructure of ultrafine grained titanium alloy from the aspects of thermodynamics and dynamics, and realized the large-scale preparation of the above microstructure by using the combination of conventional heat treatment and thermal processing, and solved the two bottleneck problems of difficult preparation and processing of ultrafine grained titanium alloy and poor structural stability.
This eqd strategy not only realizes the preparation of ultra-fine grain structure with high performance and high thermal stability of ticu, tizrcu and other titanium alloys, but also has been extended to other alloy systems including steel materials, providing a new way for the preparation of ultra-fine grain metal materials, which is of great significance for the design and research of ultra-fine grain metal materials.
