过冷液态块体非晶合金在微模具中的流动行为研究

Bulk amorphous alloys (also known as metallic glasses) have superior thermoplastic micro forming ability, which makes them draw a lot of attention in scientific research and applications. Previous work of thermoplastic forming of bulk amorphous alloys mainly focuses on the fabrication of micro structures and the exploration of applications, however, no intensive theoretical research on the micro thermoplastic forming of bulk amorphous alloys has been done, such as the influence of micro mold materials, the morphology of the micro structures on the micro molds, the surface roughness of the micro molds et al. To address these problems, we propose to study the mold filling behavior of bulk amorphous alloys in different micro molds, which are prepared by different techniques on different substrates. Through characterizing the molding filling quality and systematically investigating the influence of micro mold materials, the shape and dimension of the micro structures as well as the surface quality of the micro molds et al on the mold filling behavior, the flow mechanics would be clarified with the help of fluid mechanics. This project would be significant for the scientific research and applications of bulk amorphous alloys in the micro forming fields and could provide the experimental data and theoretical basis for the further practical application of amorphous alloys as micro forming materials.

块体非晶合金（也称金属玻璃）具有优异的热塑性微成形性能，这种性质使得其在科学研究和实际应用中得到了广泛的关注。目前关于块体非晶合金热塑性微成形的研究主要集中在微结构的定性制备以及应用前景探索上，而微模具（在块体非晶合金表面制备微结构的母版）的材料、微模具上微结构形态分布、微模具表面粗糙度等因素对块体非晶合金热塑性微成形中的影响并没有完善的认识。针对该问题，本项目拟在金属、硅、氧化铝等不同材料基体上制备不同种类的微模具，通过研究过冷液态块体非晶合金在不同微模具中的热塑性充型行为，对充型质量进行表征评估，系统地考察微模具的材料、微结构形状、尺寸大小以及微模具的表面质量等因素对于该流动行为的影响，并利用流体力学管道流动理论阐明其在多因素影响下的动力学机制。该项目的开展对于块体非晶合金在微成形领域的研究与应用有重要的意义，可以为其提供理论依据和实验数据。

块体非晶合金（也称金属玻璃）具有优异的物理、化学和力学性能，使得其在科学研究和实际应用中得到了广泛的关注。目前关于非晶合金的研究主要集中在大尺寸化及变形机理上，而非晶合金新型的成型技术和手段目前并没有被广泛关注或者研究不够深入。针对该问题，本项目在大量研究基础之上，提出了利用高频超声振压的方法成型非晶合金，通过定性定量研究高频超声振压对于非晶合金成型行为的影响，系统地考察非晶合金与高频超声振动的相互作用机理、研究高频超声下非晶合金可能的成型加工方式等。该项目的开展对于非晶合金的研究与应用有重要的意义，可以为其提供理论依据和实验数据。