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Analysis of a kink pair model applied to a peierls mechanism in basal and prism plane slips in sapphire (α-Al2O3) deformed between 200° and 1800°C
(The American Ceramic Society, 2008)
A model based on dislocation glide controlled by the nucleation and propagation of kink pairs in a high Peierls stress crystal is revisited and modified to account for changes in dislocation densities and segment lengths ...
Chromium hardening and Peierls mechanism for basal slip in sapphire (α-Al2O3) at temperatures between 900 and 1500 °C
(European Ceramic Society, 2007)
The plastic deformation of Cr3+-doped α-Al2O3 (ruby) with four distinct Cr concentrations has been studied at temperatures between 900 and 1500 °C. The mechanical tests indicate that the processes of dislocation multiplication ...
Basal slip latent hardening by prism plane slip dislocations in sapphire (α-Al2O3)
(Elsevier, 2010)
The properties of sapphire (α-Al2O3) predeformed at T = 1450 °C by 〈〉{} prism plane slip and subsequently deformed in 〈〉(0 0 0 1) basal slip between 1050 and 1250 °C were investigated. The critical resolved shear stress ...
α-Al2O3 sapphire and rubies deformed by dual basal slip at intermediate temperatures (900–1300 °C): I. Dislocation organization
(Elsevier, 2009)
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 ...
α-Al2O3 sapphire and rubies deformed by dual basal slip at intermediate temperatures (900–1300 °C): II. Dissociation and stacking faults
(Elsevier, 2009)
Sapphire and rubies (undoped and Cr-doped α-Al2O3 single crystals) have been deformed in compression at temperatures lower than those previously used in studies of dislocations in the basal slip plane. Above 1400 °C, several ...