Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 734, Issue -, Pages 437-444Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.08.007
Keywords
Co-Al-W superalloys; PM route; Mechanical properties; Nanoindentation; Mechanical milling
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Funding
- German Academic Exchange Service
- EU [NMP3-SE-2013-604344]
- Deutsche Forschungsgemeinschaft (DFG) of the Collaborative Research Center: From Atoms to Turbine Blades - A Scientific Approach for Developing the Next Generation of Single Crystal Superalloys [SFB/TR 103]
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A Co-based superalloy, Co-9Al-9W (at%), was processed by mechanical alloying by high-energy milling of elemental powders and consolidated by field assisted hot pressing (FAHP). The milled powder particles mainly consist of undissolved bcc-W as well as WC and an Al and W rich fcc-gamma Co solid solution. After consolidation and heat treatment a fine grained microstructure with a high fraction of carbides and a gamma/gamma' microstructure was obtained. The compressive yield strength at room temperature was found to be 45% higher than that of previously reported results for Co-based superalloys. A similar level of strength was found at 700 degrees C. These extraordinary properties can be explained due to the multitude of hardening mechanisms that sintered Co-based superalloys possess: gamma' precipitation, carbide formation and the ultra-fine se-grain size promoted by the fast consolidation technique.
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