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Influence of Co content on stacking fault energy in Ni–Co base disk superalloys

Published online by Cambridge University Press:  04 November 2011

Yong Yuan ,
Yuefeng Gu ,
Chuanyong Cui ,
Toshio Osada ,
Zhihong Zhong ,
Toshimitsu Tetsui ,
Tadaharu Yokokawa  and
Hiroshi Harada
Yong Yuan*
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Yuefeng Gu
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Chuanyong Cui
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Toshio Osada
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Zhihong Zhong
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Toshimitsu Tetsui
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Tadaharu Yokokawa
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
Hiroshi Harada
Affiliation:
High Temperature Materials Center, National Institute for Materials Science, Ibaraki 305-0047, Japan
*
a)Address all correspondence to this author. e-mail: yuan.yong@nims.go.jp
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Abstract

The influence of Co content on stacking fault energy (SFE) of the γ matrix in four Ni–Co base superalloys, including newly developed alloys, has been studied by utilizing high-resolution transmission electron microscopy. The results indicated the SFE was not linear with Co content of the γ matrix. The lowest SFE could be attained at around 34.0 at.% Co. This effect was attributed to variation of electron holes, saturated Co content in the matrix, and the effect of Co on the partition coefficient of other alloying elements. A high density of twins was related to low SFE and could improve the mechanical properties.

Keywords

AlloyTransmission electron microscopyNi
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 22 , 28 November 2011 , pp. 2833 - 2837
Copyright
Copyright © Materials Research Society 2011

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