高玻璃形成能力合金的高通量实验筛选方法

Traditional preparing and screening methods for metallic glasses based on rapid solidification techniques from melt, like melt spinning, copper mold casting, etc., exhibited the problems of low efficiency and high cost. In recent years, high-throughput film preparation of alloy library based on multi-target co-deposition technique was provided successfully to accelerate the screening efficiency for the development of new metallic glasses. However, the main drawback of the high-throughput method is the extremely high cooling rate (~10⁸ K/s) during the formation of the film samples, compared with the traditional glass-forming condition of the aimed metallic glasses with high glass-forming ability (the normal critical cooling rate ≤10³ K/s). Recently, the laser melting and quenching technique on the surface of master alloys was developed to offer a new choice for high-throughput screening of metallic glasses with high glass-forming ability. Comparable with the preparation processes using the traditional rapid-solidification methods, the preparation of metallic glasses using this laser method is as the following process: firstly rapidly melting the local surface of the master alloy using laser beam to form melt; then conducting heat away from the substrate to achieve rapid solidification of the melt with the cooling rate of 10³‒10⁵ K/s and remain the amorphous structure on the surface of the master alloys with high glass-forming ability. Compared with the traditional methods, this new paradigm using the laser melting and quenching technique has significant advantages in the reduction of research costs and simplification of the screening processes, which can improve high efficiency and accuracy of the development of metallic glasses with high glass-forming ability.