In situ Deformation of γ1 Nickel Base Single Crystals. The Movement of Screw Dislocations in (001) Planes from – 100°C to 880°C

1989 ◽  
pp. 205-210
Author(s):  
N. Clément ◽  
D. Caillard ◽  
P. Lours ◽  
A. Coujou
Keyword(s):  
Single Crystals ◽  
Screw Dislocations ◽  
Nickel Base ◽  
In Situ Deformation

In Situ Deformation at 850°C of Standard and Rafted Microstructures of Nickel Base Superalloys

2006 ◽  
Vol 509 ◽  
pp. 57-62 ◽  
Author(s):  
Nicole Clément ◽  
Mustafa Benyoucef ◽  
M. Legros ◽  
Pierre Caron ◽  
Armand Coujou
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Stress Conditions ◽  
Actual Temperature ◽  
In Situ Study ◽  
The Creation ◽  
Nickel Base ◽  
In Situ Deformation

An in situ study of the plastic deformation of <001> single crystals of an industrial superalloy has been performed at 850 °C in a TEM to observe directly the micromechanisms which control the deformation under the actual temperature and stress conditions experienced by this material in aeroengines. A comparison between the creation and propagation modes of moving dislocations in the standard microstructure after annealing and the rafted microstructure after 20 h of creep at 1050°C evidence the important role of the width of the γ channels as well as the strength of the γ/γ’ interface in controlling the shearing events of γ’ channels.

scholarly journals AFM Observation of Fe-Al Single Crystals under in situ Deformation

2012 ◽  
Vol 122 (3) ◽  
pp. 618-621 ◽  
Author(s):  
J. Veselý ◽  
M. Cieslar ◽  
J. Kopeček
Keyword(s):  
Single Crystals ◽  
In Situ Deformation ◽  
Afm Observation

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

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