超稳块体非晶合金的制备与特性研究

非晶合金是通过熔体急冷得到的兼具金属和玻璃、固体和液体特性的高性能金属材料，通常处于高能量的非平衡亚稳态。在过去的十多年里，基于沉积技术制备的超稳非晶合金薄膜为有效解决非晶合金的亚稳性难题带来了希望，然而仅能得到二维尺寸，严重限制了对超稳非晶合金的科学认识及其工程应用前景，因此，如何有效制备大尺寸块体超稳非晶合金具有极其重要的科学与工程意义。本项目拟引入高频超声振压技术，基于非晶合金的结构非均匀性特性及超声对非晶合金结构的调制作用，探索制备出超稳块体非晶合金，研究超稳块体非晶合金的结构特性与物性特征，对比块体超稳非晶合金与二维薄膜超稳非晶的异同，阐明块体超稳非晶形成的物理机制，为解决块体非晶合金的亚稳定难题提供新的方法，促进科学家对非晶材料本质的理解，进一步拓展非晶合金的应用。

Amorphous alloy is a kind of high performance metal material with the characteristics of metal and glass, solid and liquid, which is obtained by the rapid cooling of melt. It is usually in a non-equilibrium metastable state of high energy. To address this issue, ultrastable amorphous alloy thin films were prepared by deposition techniques in the past decade. However, only two dimensional size can be obtained by this method, which have severely restricted the scientific understanding of ultrastable nature of amorphous alloy and its engineering application. Therefore, how to efficient preparation of large size ultrastable bulk amorphous alloy has extremely important scientific and engineering significance. In this project, a high frequency ultrasonic vibration technology has been introduced to explore the preparation of ultrastable bulk amorphous alloy, basing on the structural heterogeneity characteristic and ultrasonic modulation effect on the structure of amorphous alloy. Through the study of the structure feature and physical characteristics, contrastive analysis of the differences between 3D bulk and 2D thin film ultrastable amorphous alloy, the formation mechanism of ultrastable amorphous alloy would be clarified. This project would provides a new method to solve the metastable problem of bulk amorphous alloy, promotes the understanding of nature for amorphous material, and further expands its application.