ON THE FORMATION AND MOTION OF [010] - DISLOCATIONS DURING HIGH-TEMPERATURE LOW-STRESS CREEP OF SUPERALLOY SINGLE-CRYSTALS

Authors
DLOUHY A EGGELER G
Citation
A. Dlouhy et G. Eggeler, ON THE FORMATION AND MOTION OF [010] - DISLOCATIONS DURING HIGH-TEMPERATURE LOW-STRESS CREEP OF SUPERALLOY SINGLE-CRYSTALS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 234, 1997, pp. 958-961
Citations number
8
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
234
Year of publication
1997
Pages
958 - 961
Database
ISI
SICI code
0921-5093(1997)234:<958:OTFAMO>2.0.ZU;2-W
Abstract
The cutting of gamma'-particles by dislocations during shear creep of superalloy single crystals loaded on the shear system [110]{111} at T = 1025 degrees C and tau = 85 MPa is analysed. It was found that two g amma-matrix channel dislocations with different Burgers vectors of typ e (a0)/(2)[110] jointly shear the gamma'-particle and compose a superd islocation with a Burgers vector of a(0)[010]. Peach-Koehler forces we re calculated which are associated with the birth of these superdisloc ations. The results of the numerical study show that the formation of [010] dislocations in the superalloy microstructure is energetically f avourable. (C) 1997 Elsevier Science S.A.