Bulk amorphous Al-alloys by ball milling and spark-plasma-sintering

铝基非晶合金具有很大的商业应用潜力，因为它们的强度(1200-1500兆帕)比传统的晶态铝基合金(400-500兆帕)要高，尽管它们在熔体凝固时表现出了规模的限制。到目前为止，还没有以铝为主要成分的大块金属玻璃(BMG)的铸造。本课题的目的是利用粉末冶金技术开发新型的高Al块体非晶合金，并克服这一局限性。为了达到这一目的，有必要设计具有明显过冷液相区和高热稳定性的新型铝基非晶合金粉末，并优化机械合金化制备非晶铝基合金粉末和放电等离子烧结(SPS)完全致密化的工艺条件。此外，有必要对这些新型块体Al-非晶合金的结构和热性能进行评价，对它们的力学行为进行评价，并试图找到它们的力学性能的模型描述，并将结果与相应的非淬火合金的结果进行比较。

Al-based amorphous alloys have been suggested for commercial applications with a great potential due to their high strength (1200-1500 MPa) compared to conventional crystalline Al-based alloys (400-500 MPa) even though they have shown a limit of scale upon solidification of the melt. Up to now no casting of bulk metallic glasses (BMGs) with aluminum as majority component is possible. The purpose of this project is to develop novel bulk Al-based amorphous alloys with high content of Al by powder metallurgy and to overcome this limitation. In order to achieve this purpose it is necessary to design novel Al-based amorphous alloy powders with a distinct supercooled liquid region and high thermal stability, and to optimize the processing conditions for the production of amorphous Al-based alloy powders by mechanical alloying and for their full densification through Spark Plasma Sintering (SPS). In addition, it is necessary to evaluate the structural and thermal properties of these novel bulk Al-amorphous alloys, their mechanical behavior and to try to find a model description for their mechanical properties, as well as to compare the results with those of corresponding asquenched alloys.