Recent developments in superalloy technology for turbine aerofoil applications are reviewed, such as single crystals (SC), oxide dispersion strengthening (ODS), and rapid solidification (RS). Single crystal and ODS superalloys are in production use in aircraft turbine engines. While ODS superalloys exhibit higher strength at high temperatures, SC superalloys are somewhat stronger at intermediate temperatures. It will depend on engine design which alloy can give greater advantage. The strength potential of RS superalloys is probably less than or equal to SC superalloys which does not justify the complicated processing. If SC or ODS technology is to be applied to industrial engines of high power, more corrosion resistant alloys must be developed and component fabrication methods will have to be scaled-up.
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