G. MULLER, STRUERS GMBH / SCIENCE PHOTO LIBRARY G. MULLER, STRUERS GMBH / SCIENCE PHOTO LIBRARY
Light micrograph of a polished section of a cobalt and chromium-based "superalloy", a material used in the construction of turbine blades for jet engines. Additives of carbon, tungsten, molybdenum, titanium and tantalum are also commonly used, which form hard carbide particles that lock the alloy's microstructure together. Such alloys are almost impossible to machine, so components need to be moulded. This sample displays a dendritic, cast structure. White carbides appear in the interdendritic spaces. Specimen preparation: Beraha colour etch. Magnification: x70 at 35mm size. Reference: MICROCOSMOS Page 147, Figure 7.43.
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