scholarly journals An experimental study of the mobility of edge dislocations in pure copper single crystals

1970 ◽  
Vol 21 (174) ◽  
pp. 1147-1168 ◽  
Author(s):  
K. M. Jassby ◽  
T. Vreeland
Keyword(s):  
Experimental Study ◽  
Single Crystals ◽  
Pure Copper ◽  
Copper Single Crystals ◽  
Edge Dislocations

THE PLASTIC DEFORMATION OF THIN COPPER SINGLE CRYSTALS: II. AN ELECTRON MICROSCOPE STUDY OF THE SURFACE STRUCTURE

1967 ◽  
Vol 45 (2) ◽  
pp. 777-786 ◽  
Author(s):  
J. T. Fourie
Keyword(s):  
Single Crystals ◽  
Path Length ◽  
Electron Microscope Study ◽  
Stress Gradient ◽  
Thin Layers ◽  
Bulk Deformation ◽  
Glide Path ◽  
Significant Difference ◽  
Copper Single Crystals ◽  
Edge Dislocations

A comparison is made between the slip-line structure of two copper single crystals, where the glide path length of edge dislocations is 1.44 mm and 0.066 mm, respectively. No significant difference is found. This leads to the conclusion that dislocations that escape at the surface of a crystal are generated very close to it.Stress–strain experiments on thin layers of crystal from the surface and from the center of previously deformed crystals confirm that slip lines are not representative of the bulk deformation. They also show that a flow-stress gradient exists between the surface and the center of the crystal. It is argued that the existence of such a gradient can be used to explain the dependence of the extent of stage I on the glide path length of edge dislocations.

Analysis of Deformation Textures and Microstructure in ECAE Processed Copper Single Crystals via Route C

2007 ◽  
Vol 561-565 ◽  
pp. 929-932
Author(s):  
Gang Wang ◽  
Shi Ding Wu ◽  
Yan Dong Wang ◽  
Ya Ping Zong ◽  
Claude Esling ◽  
...  
Keyword(s):  
Single Crystals ◽  
Equal Channel Angular Extrusion ◽  
Texture Evolution ◽  
Effective Means ◽  
Pure Copper ◽  
Ultrafine Grained ◽  
Deformation Textures ◽  
Ultrafine Grained Materials ◽  
Copper Single Crystals ◽  
Mechanisms Of Plastic Deformation

Equal channel angular extrusion (ECAE) is an effective means of producing ultrafine-grained materials with extraordinary mechanical properties. Texture evolution and microstructure in pure copper single crystals processed by ECAE for up to five passes via route C are investigated to understand mechanisms of plastic deformation and grain refinement during ECAE. The experimental textures after the third pass ECAE process recovers that after one pass ECAE process. The main textures approaches a stable one after four passes of ECAE process via Route C while the intensity of main texture components decreases gradually. Local TEM-OIM measurements shows that grain subdivision in ECAE-processed samples occurs with the formation of many low angle grain boundaries.

scholarly journals Stress corrosion cracking of pure copper single crystals in NaNO2 solution.

1989 ◽  
Vol 38 (428) ◽  
pp. 552-556 ◽  
Author(s):  
Hitoshi UCHIDA ◽  
Shozo INOUE ◽  
Masataka KOYAMA ◽  
Keiji KOTERAZAWA
Keyword(s):  
Stress Corrosion ◽  
Single Crystals ◽  
Stress Corrosion Cracking ◽  
Pure Copper ◽  
Corrosion Cracking ◽  
Copper Single Crystals

Sub-Grain Size and Hall-Petch Relation in Pure Copper Single Crystals

2007 ◽  
Vol 345-346 ◽  
pp. 29-32
Author(s):  
Sei Miura ◽  
Yoshito Nishimura ◽  
Nagato Ono
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
Single Crystals ◽  
Pure Copper ◽  
Petch Relation ◽  
Low Dislocation Density ◽  
Initial Dislocation Density ◽  
Bridgeman Method ◽  
Copper Single Crystals ◽  
Critical Resolved Shear Stress

The effect of sub-grain on the yield stress of pure copper single crystals with the [253] orientation was investigated by using the etch pit technique. The single crystal plates were successfully prepared from the seed crystals, which were produced at the melting temperature of 1473 K by the Bridgeman method. The present investigation confirmed the Hall-Petch relation concerning the effect of sub-grain boundaries on the macroscopic yielding of pure copper. The result derived from the extrapolation of the relationship of critical resolved shear stress (CRSS) and the initial dislocation density and sub-grain size is in good agreement with the evaluation in high purity copper single crystals of low dislocation density.

Creation and Motion of Edge Dislocations in Copper Single Crystals

1997 ◽  
Vol 505 ◽  
Author(s):  
Masaodoyama ◽  
Yoshiaki Kogure ◽  
Tadatoshi Nozaki
Keyword(s):  
Molecular Dynamics ◽  
Single Crystals ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Shockley Partial Dislocation ◽  
Shockley Partial ◽  
Small Crystals ◽  
The Creation ◽  
Copper Single Crystals ◽  
Edge Dislocations

ABSTRACTDislocations were created near the center of the surface (110) of copper small crystals whose surfaces are (111), (111), (110), (110), (112), and (112) by use of n-body atom potentials and molecular dynamics. At first, a Heidenreich-Shockley partial dislocation was created. As the partial dislocation proceeds, the partial dislocation and the surface was connected with a stacking fault until the next Heidenreich-Shockley partial dislocation was created at the surface.Just before the creation of a partial dislocation the stress was the highest. For larger crystals, forming a step on (110) plane was not enough and a shear was necessary to move dislocations.

Formation of Deformation Twins and Related Shear Bands in Copper Single Crystals Pressed by ECAP

2010 ◽  
Vol 654-656 ◽  
pp. 1231-1234
Author(s):  
Takumi Ikeda ◽  
Hiroyuki Miyamoto ◽  
Toshiyuki Uenoya ◽  
Satoshi Hashimoto ◽  
Alexei Vinogradov
Keyword(s):  
Shear Band ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Pure Copper ◽  
Shear Bands ◽  
Large Angle ◽  
Deformation Twins ◽  
Crystallographic Feature ◽  
The Matrix ◽  
Copper Single Crystals

The pure copper single crystals with specific crystallographic orientated were subjected to ECAP for one pass at room temperature. Two types of shear bands were observed. Type 1 shear bands were constructed with clusters of distorting micro shear bands and matrix. Micro shear band and matrix were delineated by large-angle grain boundaries, and these two orientations are in a twinning relationship. Parallel sets of deformation twins were observed in the matrix. Type 2 shear bands had no crystallographic feature, and shear band and matrix were considered as low-angle grain boundaries. Deformation twin was not observed both in matrix and the shear bands.

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