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α-Al2O3 sapphire and rubies deformed by dual basal slip at intermediate temperatures (900–1300 °C): I. Dislocation organization

Identificadores del recurso

1873-2453

http://hdl.handle.net/10396/27140

Procedència

(Helvia: Repositorio Institucional de la Universidad de Córdoba)

Fitxa

Títol:: α-Al2O3 sapphire and rubies deformed by dual basal slip at intermediate temperatures (900–1300 °C): I. Dislocation organization
Tema:: Sapphire; Ruby; Dislocation microstructure; Basal slip; Peierls mechanism
Descripció:: Under a load orientation that hinders twinning and impedes fracture, sapphire and Cr-doped α-Al2O3 single crystals (rubies) were deformed from 1500 °C to slightly above the brittle to ductile transition temperature of 900 °C. Transmission electron microscopy observations of dislocation structures in rubies and sapphire deformed at 1000 °C and at 1300 °C show features such as long straight segments, dipoles and loops, the formation mechanisms of which are discussed. The operation of two glide directions in the basal plane promotes specific, temperature-dependent dislocation reactions, including “pseudo dipoles” formed by attractive dislocations with different Burgers vectors. At the lowest temperatures explored, the deformation structure comprises a large density of straight dislocation segments along and directions typical of a Peierls-controlled dislocation motion that supports recent modelling of the temperature dependence of the CRSS. The companion paper (Part II) deals with dislocation fine structure and in particular with the mechanisms involved in the formation of a variety of faulted debris.
Font:: Acta Materialia, Vol 57, Issue 10, pp 2873-2878 (2009)
Idioma:: English
Relació:: https://doi.org/10.1016/j.actamat.2009.02.045; Gobierno de España. MAT2003-04199-CO2-02
Autor/Productor:: Castillo-Rodríguez, Miguel; Castaing, J.; Muñoz, A.; Veyssière, P.; Domínguez-Rodríguez, A.
Editor:: Elsevier
Drets:: https://creativecommons.org/licenses/by-nc-nd/4.0/; info:eu-repo/semantics/openAccess
Data:: 2024-02-06T07:57:54Z; 2009
Tipo de recurso:: info:eu-repo/semantics/article
Format:: application/pdf

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