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Effect of a transverse thermal gradient on the microstructure of a directionally solidified 73C eutectic alloy
Author(s) -
Staniek G.,
Fritscher K.,
Wirth G.
Publication year - 1979
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19790100208
Subject(s) - eutectic system , temperature gradient , materials science , isothermal process , alloy , carbide , microstructure , directional solidification , thermal , metallurgy , composite material , turbine blade , turbine , thermodynamics , physics , quantum mechanics
The thermal stability of a directionally solidified (d. s.) eutectic CoCrCAl‐alloy in a thermal gradient is compared to isothermal conditions. A device has been designed and constructed for examination of d. s. eutectics in high temperature gradients at temperatures above 1300 K in different atmospheres and vacuum. Experiments in this gradient furnace show coarsening of the carbide fibres forming the aligned strengthening phase. A microstructural instability resulting from the transformation of carbide fibres has been observed. These effects are discussed in relation to isothermal conditions and their implications on the applicability of the alloy as high temperature gas turbine blade material.