Abstract
At the present time, single-crystal superalloys have the highest temperature capability and the best combination of elevated temperature properties of any structural materials and have been successfully applied as turbine airofoils. Although several special alloys suitable for single-crystal processing have been developed in recent years, only few efforts have been put into the development of so-called "hot corrosion-resistant single-crystal superalloys" which will be suitable for long-term and high-performance marine and industrial gas turbine applications. The purpose of this study is to search for the proper alloy compositions for such alloys with the guide of New Phacomp (PHAse COMPutation). This method is a newly developed alloy design concept based on DV-Xo: cluster calculations of the electronic structure of transition metals [1-3], in which Md and Bo (d-orbital energy level and bond order, respectively, of alloying transition metals) are employed as the parameters controlling the phase stability. In the alloy design process, the average values of Md and Bo are defined by taking the compositional average as
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