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Title of article :
The precipitation of topologically close-packed phases in rhenium-containing superalloys Original Research Article
Author/Authors :
C.M.F. Rae، نويسنده , , R.C Reed، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2001
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Abstract :
Most modern single crystal alloys are thermodynamically unstable with respect to the formation of topologically close-packed (TCP) phases due to the addition of solid solution strengtheners, such as rhenium, molybdenum and tungsten. The occurrence, nucleation and growth of TCP phases in a number of rhenium-containing second generation alloys have been studied. It has been found that all the alloys form the σ phase; in some cases as a meta-stable intermediate. Most go on to form either the μ of P phase, depending on the alloy composition, the second phase nucleating from the σ phase. The structure of the σ phase is shown to depend on the fit between the γ matrix and the σ phase and it is suggested that alloys which show good lattice fit suffer accelerated TCP precipitation.
Keywords :
Intermetallic compounds , growth , Nucleation , Microstructure , Stability , Superalloys
Journal title :
ACTA Materialia
Serial Year :
Link To Document :