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Development of a database for the prediction of phases in pt-based Superalloys:cr-pt-Ru

Rare Metals 2006年第5期25卷 597-607页

作者： A.Watson L.A.Cornish R.Süss Institute for Materials Research School of ProcessMaterials and Environmental EngineeringUniversity of LeedsLeedsUK Advanced Materials Division MintekPrivate Bag X3015Randburg2125South AfricaDST/NRF Centre of Excellence for Strong MaterialsUniversity of the WitwatersrandJohannesburg2025South Africa Advanced Materials Division MintekPrivate Bag X3015Randburg2125South AfricaDST/NRF Centre of Excellence for Strong MaterialsUniversity of the WitwatersrandJohannesburg2025South Africa School of Chemical and Metallurgical EngineeringUniversity of the WitwatersrandJohannesburg2025South Africa

Work has been ongoing in building a thermodynamic database for the prediction of phase equilibria in pt-based superalloys. The alloys are being developed for high texture applications in aggressive environments. The database will aid the design of alloys by enabling the calculation of the composition and proportions of phases present in alloys of different compositions. In order to extend this database, a preliminary assessment of the cr-pt-Ru system has been undertaken, using a combination of Pandat and MTDATA software. As a first step, it was necessary to provide thermodynamic models for the three associated binary systems. Owing to a lack of thermodynamic information for these systems, the binary assessments were based on phase diagrams available in the literature. Using recent experimental phase equilibria data for the ternary system, a preliminary assessment of the cr-pt-Ru system has been produced. In this preliminary assessment, simplified models were employed for the L12 and sigma phases with a view to extending the descriptions as new experimental information becomes available.

关键词： cr-pt-rh thermodynamics assessment phase diagram

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