Self-organization of plastic deformation and deformation relief in FCC single crystals

2018 ◽  
Vol 117 ◽  
pp. 202-213 ◽  
Author(s):  
E.A. Alfyorova ◽  
D.V. Lychagin
Keyword(s):  
Plastic Deformation ◽  
Single Crystals ◽  
Self Organization ◽  
Deformation Relief

Rules of Fragmentation and Localization at Aluminium Single Crystal Division during Compression Test

2014 ◽  
Vol 1013 ◽  
pp. 84-90 ◽  
Author(s):  
Ludmila A. Teplyakova ◽  
Irina Bespalova ◽  
Tatyana Kunitsyna
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Single Crystals ◽  
Compression Test ◽  
Deformation Process ◽  
Front Face ◽  
Experimental Investigations ◽  
Macroscopic Level ◽  
Plastic Deformation Process ◽  
Deformation Relief

This work presents the results of experimental investigations into deformation relief formed at the faces of aluminium single crystals. The aim of the investigations was to define the rules of macro fragmentation and macro localisation processes in plastic deformation. It was established that for the families of maximum loaded planes {111} in the aluminium single crystals, one can differentiate volumes which aren't limited to the specimen's front face. It is assumed that shearing in these volumes is eased during plastic deformation due to the absence of a reverse stress. Moreover, it is suggested that such volumes are called volumes of eased slip (VES). In addition to this, the role played by the volume of eased slip at the macroscopic level during the plastic deformation process was examined.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

Effect of orientation on the plastic deformation of aluminum single crystals and bicrystals

JOM ◽  
1957 ◽  
Vol 9 (1) ◽  
pp. 136-140 ◽  
Author(s):  
R. S. Davis ◽  
R. L. Fleischer ◽  
J. D. Livingston ◽  
Bruce Chalmers
Keyword(s):  
Plastic Deformation ◽  
Single Crystals

Plastic Deformation of α‐Arsenic Single Crystals

1968 ◽  
Vol 39 (11) ◽  
pp. 5145-5149 ◽  
Author(s):  
M. N. Shetty ◽  
J. B. Taylor
Keyword(s):  
Plastic Deformation ◽  
Single Crystals

Shear-Type Mechanisms of Deformation Development in Structural Elements of a Deformation Relief

2015 ◽  
Vol 788 ◽  
pp. 211-217
Author(s):  
Dmitry V. Lychagin ◽  
Ekaterina A. Alfyorova
Keyword(s):  
Single Crystals ◽  
Deformation Process ◽  
Structural Elements ◽  
Slip Bands ◽  
Relief Element ◽  
Shear Type ◽  
Deformation Relief ◽  
Mechanisms Of Deformation

We studied basic structural elements of a deformation relief formed on lateral faces of nickel single crystals under compression. We correlated deformation heterogeneity with the type of structural elements of the relief. It was revealed that deformation heterogeneity did not depend on the type of a relief element or its scale. In addition, some studies were carried out to define ways of the deformation process in slip bands, mesa-and macrobands of deformation as well as in folds. It was found that a slip developed in separate slip bands resulted in their merging into micropackets with a slip occurring concurrently in several parallel planes. It led to the formation of a mesa-or macroscopic element of the deformation relief. We observed both intrusion and extrusion in the material in macrobands of [111]-single crystals as well as the formation of folding areas discussed.

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