Mo-Si-B alloys with a Mo-matrix and embedded intermetallic phases

Mo-Si-B合金具有良好的蠕变性能，是未来高温应用的潜在候选者。同时，需要一个较低的韧脆转变温度。本课题的目的是通过不同的途径来降低韧脆转变温度。这包括对成分的更改以及对所选生产路线的更改。进一步的例子是高温热处理的影响，以及熔体冶金和粉末冶金生产路线的不同。此外，还应确定这些参数对显微组织的影响。这些都可以在扫描和过渡电子显微镜下完成。将进行蠕变实验，以确定微观结构变化对这些合金蠕变性能的影响。其目标是在保持可接受的蠕变性能的同时，一定程度上降低延性到脆性的转变温度。

Mo-Si-B alloys are a potential candidate for future high temperature applications because of their good creep properties. At the same time a low ductile to brittle transition temperature is desired.Aim of the project is to lower the ductile to brittle transition temperature with different approaches. This includes changes to the composition as well as changes to the chosen production route. Further examples are the influence of heat treatments at high temperatures as well as the difference of melt- and powder metallurgical production route. Furthermore the influence of these parameters on the microstructure should be determined. These can be done at the Scanning- and Transition Electron Microscope. Creep experiments will be carried out in order to determine the impact on microstructural changes on the creep properties of these alloys. The objective is a definite reduction of the ductile to brittle transition temperature while maintaining acceptable creep properties at the same time.