New Material with Great Prospect -- Rapidly Solidified Microcrystal Material

摘要

The main characteristics of the rapidly solidified microcrystal material are: 1) It has a very fine and homogeneous structure. When the cooling rate is 100,000 - 1,000,000 C/s, the size of the crystal grain is about 0.5 to a few micrometers. Its partial resolution is very small. The range of the partial resolution, and the distance between each crystal branch arm is about 0.5-5 micrometers. As the cooling rate increases, the crystal grain can be further refined and the partial resolutin can be further reduced or even eliminated. Because of the very fine and homogeneous structure, the microcrystal material has very good mechanical properties. Compared with ordinary materials, its strength and ductility, stress and corrosion resistance, fatigue fracture resistance, and high temperature oxidation resistance are much higher. 2) The solid solubility is enhanced remarkably. Due to the high cooling rate, the solid solubility of the rapidly solidified material can be increased remarkably. By using the rapid solidification technique, we not only can obtain a high strength material, but more importantly we also can add some metal elements into the metal alloys. These metal alloys which have some special properties can not be obtained by ordinary techniques.