Interaction processes between dislocations and particles in the ODS nickel-base superalloy INCONEL MA 754 studied by means of in situ straining in anHVEM

Authors
Haussler, D Reppich, B Bartsch, M Messerschmidt, U
Citation
D. Haussler et al., Interaction processes between dislocations and particles in the ODS nickel-base superalloy INCONEL MA 754 studied by means of in situ straining in anHVEM, MAT SCI E A, 309, 2001, pp. 500-504
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
309
Year of publication
2001
Pages
500 - 504
Database
ISI
SICI code
0921-5093(20010715)309:<500:IPBDAP>2.0.ZU;2-8
Abstract
In situ straining experiments in a high-voltage electron microscope (HVEM) have been performed on the oxide-dispersion strengthened (ODS) nickel-base superalloy INCONEL MA 754 at 1020 and 1065 K. The results can be interprete d by interfacial pinning of dislocations at the dispersoids and, in some ca ses, by the Orowan mechanism. In addition to the thermally activated detach ment of dislocations from particles, a viscous friction mechanism possibly due to point defect diffusion in the dislocation cores and Taylor hardening contribute to the flow stress. (C) 2001 Elsevier Science B.V. All rights r eserved.