Research on the behavior of metal twinning makes titanium hard and malleable
Metals have two of the most important mechanical properties, strength and plasticity, and they are not compatible. How to make metal hard and malleable is the direction that scientists have been working hard. The reporter learned from Nanjing University of Science and Technology on the 10th that the school has made important progress in the study of titanium metal growth behavior, providing guidance for improving material properties. The research results were recently published in the International Journal of Plastics.
Metal twinning is an important form of deformation. Previous studies have shown that high-density twins give metals a good match in strength-plasticity. In order to enhance the strength of titanium, researchers have used extrusion, cold rolling, rotary forging and other deformation methods to achieve the method of refining pure titanium grains. In recent years, researchers have found that the twinning behavior of hexagonal metal is an important deformation mode and an important way to improve the material properties, which has become a research hotspot in the field of metal plastic processing. However, the induction mechanism of twin behavior, especially the coupling of multiple competition mechanisms, has not been deeply studied.
Under the guidance of Associate Professor Li Yusheng and Associate Professor Cao Yang, under the guidance of Associate Professor Li Yusheng and Associate Professor Cao Yang, the systematic research and analysis of the backscattered electron diffraction technique proposed that the crystal orientation and the direction of the force are the main influences of the twin system selection in the high-order twinning phenomenon. Factors, found that Schmidt's law has an important role in predicting the choice of twins in high-order twinning. The local stress model established in the paper successfully simulates the local stress state of the crystal during deformation. The publication of this paper is of great significance for understanding the behavior of metal twinning.
It is reported that titanium has high specific strength and good biocompatibility, and has been widely used in aerospace, deep-sea exploration and medical clinical fields. It is known as “space metal” and “marine metal”, after iron and aluminum. “The third metal” is considered to be one of the most promising metals in the 21st century.