Effects of Zr Additions on the Microstructure and the Mechanical Behavior of PM Mo-Si-B Alloys
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In this article, our current understanding on the effects of Zr additions on the properties of three-phase Mo-Si-B alloys is reported. This novel group of materials having high melting points around 2000°C have been identified as potential alloy systems for structural applications at temperatures beyond 1200°C, e.g., for substituting or supplementing state-of-the-art nickel-base superalloys in the power generation industry. In earlier work, we developed various Mo-Si-B materials with very good high-temperature deformation behavior and, in addition, that satisfy oxidation performance. Minimum brittle-to-ductile transition temperatures of around 950°C, however, do not meet the requirements for high-grade stressed structural materials. Therefore, in a second trial, we investigate the influence of the alloying element Zr (which was already proven to increase the strength as well as the ductility of a single-phase Mo-Si alloy) on three-phase Mo-Si-B alloys.
KeywordsCreep Rate Mechanical Alloy Creep Resistance SiO2 Particle ZrO2 Particle
This research was partly supported by the German Science Foundation (DFG) within the framework of the research unit 727 “Beyond Nickelbase Superalloys.” We thank the members of this research unit (U. Glatzel, R. Völkl, C. Hochmuth, G. Eggeler, C. Somsen, and T. Depka) for fruitful cooperation and Plansee SE (Reutte, Austria) for help in compaction of the mechanically alloyed powders.
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