Shearing mechanisms of γ' precipitates by dissociated single-matrix dislocations in nickel-based superalloys

1990 ◽  
Vol 48 (4) ◽  
pp. 452-453
Author(s):  
Brigitte Décamps ◽  
Allan J. Morton
Keyword(s):  
Image Matching ◽  
Bright Field Image ◽  
Bright Field ◽  
Weak Beam ◽  
Compression Creep ◽  
Tension And Compression ◽  
Deformation Processes ◽  
Single Matrix ◽  
Shearing Mechanism ◽  
Matching Techniques

Superlattice stacking faults play an important part in the deformation processes of γ/γ' Ni-based superalloys. However, recent studies using the weak-beam technigue have brought into question the previously accepted mechanism for shearing of the γ'precipitates. A new shearing mechanism involving a single a/2<110> matrix dislocation and the nucleation of a Shockley partial has been proposed. In the present study, TEM weak-beam and bright field image matching techniques have been used to study the elementary shearing configurations of γ'precipitates in [001] single crystals of superalloys after creep (intermediate temp.) and dynamical (high temp.) tests in compression and tension.The observations show a change of configurations between compression and tension: in dynamical compression, precipitates are mainly sheared by leading S-ESF (Fig. 1); and in tension creep by leading S-ISF (Fig. 2). Both dynamical tension and compression creep give a mixture of S-ISF and S-ESF.

Optical Analysis of Strength Tests Based on Block-Matching Techniques

2011 ◽  
Vol 27 (8) ◽  
pp. 573-593 ◽  
Author(s):  
Alvaro Rodriguez ◽  
Juan R. Rabuñal ◽  
Juan L. Pérez ◽  
Fernando Martínez-Abella
Keyword(s):  
Block Matching ◽  
Optical Analysis ◽  
Strength Tests ◽  
Matching Techniques

Experiments on block-matching techniques for video coding

1994 ◽  
Vol 2 (5) ◽  
pp. 228-241 ◽  
Author(s):  
Eric Chan ◽  
Arturo A. Rodriguez ◽  
Rakeshkumar Gandhi ◽  
Sethuraman Panchanathan
Keyword(s):  
Video Coding ◽  
Block Matching ◽  
Matching Techniques
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