Strengthening of an L1(2)-ordered gamma '-intermetallic by disordered gamma-particles. Part II: Measurements of the CRSS and TEM observations of dislocation processes in Ni69Co9Al18Ti4

Authors
Pretorius, T Baither, D Nembach, E
Citation
T. Pretorius et al., Strengthening of an L1(2)-ordered gamma '-intermetallic by disordered gamma-particles. Part II: Measurements of the CRSS and TEM observations of dislocation processes in Ni69Co9Al18Ti4, ACT MATER, 49(11), 2001, pp. 1981-1985
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
ACTA MATERIALIA
ISSN journal
13596454 → ACNP
Volume
49
Issue
11
Year of publication
2001
Pages
1981 - 1985
Database
ISI
SICI code
1359-6454(20010622)49:11<1981:SOALG'>2.0.ZU;2-V
Abstract
;Strengthening of single crystals of an L1(2)-long-range ordered gamma ' -p hase by coherent disordered spherical f.c.c. gamma -precipitates has been e xperimentally investigated. The overall composition of the material is (at. %): Ni 69, Co 9, Al 18, Ti 4. The critical resolved shear stress (CRSS) has been measured at 253 K for homogeneous, i.e. gamma -free specimens and for specimens strengthened by three different gamma -precipitate dispersions. The experimental results for the CRSS are in good agreement with those obta ined by computer simulations (Part I) and are satisfactorily represented by Friedel's relation. The relevant configurations of dislocations have been studied by transmission electron microscopy. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.