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| Microstructure Evolution of A Pre-compression Nickel-Base Single Crystal Superalloys During Tensile Creep |
| XingFu Yu;;;;; |
| 沈阳工业大学 |
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Cite this article:
XingFu Yu. Microstructure Evolution of A Pre-compression Nickel-Base Single Crystal Superalloys During Tensile Creep. Acta Metall Sin, 2008, 44(8): 961-967 .
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Abstract By means of pre-compression treatment, the cubic γ′phase in the single crystal nickel-base superalloy is transformed into the P-type rafted structure. An investigation has been into the microstructure evolution of the P-type rafted structure alloy during tensile creep by means of the measurement of creep curve and microstructure observation. Results show that the P-type rafted γ′phase in the alloy is transformed into the N-type structure in the initial stages of the tensile creep. In the role of the tensile stress at high temperature, the change of the elements equilibrium concentration occurs in the γ′/γ phases, which promotes the unhomogeneous coarsening of the γ′phase, and in the further the decomposition of the P-type rafted phase occurs in the alloy to appear the groove structure. It is a main reason of the directional diffusion of the elements and dissolving abruption of the P-type rafted γ′phase up to transformed into the cuboidal-like structure that the enhancement of the chemical potential energy of the solute elements occurs in the groove regions of the P-type γ′rafted structure. And then, the lattice constriction in the horizontal interfaces of the cuboidal-like γ′phase may repel out the Al, Ta atoms with bigger radius due to the role of the shearing stress, the lattice expanding in the side interfaces of the cuboidal-like γ′phase may trap the Al, Ta atoms with the bigger radius in the role of the tension stress, which promotes the directional growing of γ′phase into the N-type rafted structure. Thereinto, the change of the strain energy density in different interfaces of the cuboidal-like γ′phase is thought to be the driving force of the elements diffusion and the γ′phase directional growth.
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Received: 23 November 2007
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