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Influence of Stacking Fault Energy on Creep Mechanism of a Single Crystal Nickel-Based Superalloy Containing Re

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Abstract:

By means of calculating stacking fault energy (SFE), measuring creep properties and contrast analysis of dislocation configuration, an investigation has been made into the influence of the stacking fault energy on the creep mechanism of the single crystal nickel-based superalloy. Results show that the alloy at 760¡æ has a lower stacking fault energy (SFE), and the SFE of the alloy increases with the temperatures. The deformed mechanism of the alloy during creep at 760¡æ is the cubical γ′ phase sheared by <110> super-dislocation which may be decomposed to form the configuration of (1/3)<112> super-Shockley partials dislocation plus the superlattice intrinsic stacking fault (SISF). The deformed mechanism of the alloy which possesses the higher SFE at 1070¡æ is the screw or edge super-dislocation shearing into the rafted γ′ phase. The SFE of the alloy at 980¡æ is intervenient between the ones of 760¡æ and 1070¡æ, the deformation mechanism of the alloy during creep is the rafted γ′ phase sheared by <110> screw and edge super-dislocations which may be decomposed into the configuration of (1/2)<110> partial dislocation plus APB.

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

2474-2479

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.2474

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Online since:

January 2012

Authors:

Su Gui Tian, Ben Jiang Qian, Yong Su, Hui Chen Yu, Xing Fu Yu

Keywords:

Contrast Analysis, Creep, Deformation Mechanism, Single Crystal Ni-Based Superalloy, Stacking Fault Energy (SFE)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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