Elastic-plastic restoration of the size of a cavity in a single crystal after hydrostatic compression

1981 ◽  
Vol 20 (11) ◽  
pp. 781-786
Author(s):  
V. G. Kononenko
Keyword(s):  
Single Crystal ◽  
Hydrostatic Compression ◽  
Elastic Plastic

Microscopy and microindentation mechanics of single crystal Fe−3 wt. % Si: Part I. Atomic force microscopy of a small indentation

1993 ◽  
Vol 8 (6) ◽  
pp. 1291-1299 ◽  
Author(s):  
S. Harvey ◽  
H. Huang ◽  
S. Venkataraman ◽  
W.W. Gerberich
Keyword(s):  
Plastic Zone ◽  
Single Crystal ◽  
Surface Displacement ◽  
Plastic Zone Size ◽  
Force Microscopy ◽  
Elastic Plastic ◽  
Atomic Force ◽  
Plastic Indentation ◽  
Volume Estimates ◽  
Small Indentation

Atomic force microscope measurements of elastic-plastic indentation into an Fe−3 wt. % Si single crystal showed that the volume displaced to the surface is nearly equal to the volume of the cavity. The surface displacement profiles and plastic zone size caused by a 69 nm penetration of a Vickers diamond tip are reasonably represented by an elastic-plastic continuum model. Invoking conservation of volume, estimates of the number of dislocations emanating from the free surface are reasonably consistent with the number of dislocations that have formed in the plastic zone to represent an average calculated plastic strain of 0.044.

Stability of elastic-plastic bodies under hydrostatic compression

1979 ◽  
Vol 15 (12) ◽  
pp. 1214-1217
Author(s):  
Zh. S. Akopyan ◽  
A. N. Guz' ◽  
A. V. Navoyan
Keyword(s):  
Hydrostatic Compression ◽  
Elastic Plastic

In situ electrochemical nanoindentation of FeAl (100) single crystal: Hydrogen effect on dislocation nucleation

2009 ◽  
Vol 24 (3) ◽  
pp. 1105-1113 ◽  
Author(s):  
Afrooz Barnoush ◽  
Christian Bies ◽  
Horst Vehoff
Keyword(s):  
Single Crystal ◽  
Surface Orientation ◽  
Dislocation Nucleation ◽  
Electrochemical Potential ◽  
Displacement Curve ◽  
Hydrogen Effect ◽  
Hydrogen Atoms ◽  
Elastic Plastic ◽  
Hydrogen Charging

The hydrogen effect on dislocation nucleation in FeAl single crystal with (100) surface orientation has been examined with the aid of a specifically designed nanoindentation setup for in situ electrochemical experiments. The effect of the electrochemical potential on the indent load–displacement curve, especially the unstable elastic-plastic transition (pop-in), was studied in detail. The observations showed a reduction in the pop-in load for both samples due to in situ hydrogen charging, which is reproducibly observed within sequential hydrogen charging and discharging. Clear evidence is provided that hydrogen atoms facilitate homogeneous dislocation nucleation.

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