体心立方金属韧脆转变机制研究进展

Body-centered-cubic (bcc)-structured metals have excellent physical properties, such as high melting points, high strength and excellent creep resistance, radiation tolerance, and good compatibility with liquid metals, which are widely used in high-tech fields, such as nuclear reactors, satellites, aircraft, rockets, and engines. However, their low-temperature brittleness and ductile-to-brittle transition characteristics limit their applications. Therefore, a deep understanding of the ductile-to-brittle transition mechanism is of great significance for regulating the ductile-to-brittle transition behavior of bcc-structured metals. In this review, taking bcc-structured metals as an example, the history of the ductile-to-brittle transition investigations in bcc metals was retrospected, the main research progress on this topic was introduced, the newly developed methods to tune the ductile-to-brittle transition temperature of metals was discussed, and the key points to be focused on in the future was listed.