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Dynamic friction stresses in the γ phase of a nickel-based superalloy

Dynamic friction stresses in the γ phase of a nickel-based superalloy

Authors :
F. Pettinari
Armand Coujou
N. Clément
Mustapha Jouiad
Source :
Philosophical Magazine A. 79:2591-2602
Publication Year :
1999
Publisher :
Informa UK Limited, 1999.

Abstract

In-situ deformation experiments were performed on single crystals of the short-range-order-containing γ phase of a nickel-based superalloy. The dislocation pile-ups moving under stress are used as a probe exploring this complex solid solution and giving precise information on the local glide resistance encountered. Their analysis gives access for the first time to several contributions to this glide resistance. The threshold friction stress, which pile-ups must overcome in order to move is equal to the dynamic friction stress, which the pile-up experiences when propagating at a constant velocity. In comparison, the glide resistances deduced from the analysis of relaxed configurations are shown to be significantly underestimated. The softening effect due to the destruction of short-range order is also quantitatively determined.

Details

ISSN :
14606992 and 01418610
Volume :
79
Database :
OpenAIRE
Journal :
Philosophical Magazine A
Accession number :
edsair.doi...........53d99d91327121e494cb5f5637dd424f
Full Text :
https://doi.org/10.1080/01418619908212011