Internal friction due to hysteretic dislocation motion in solid solution crystals

1983 ◽  
Vol 54 (5) ◽  
pp. 2338-2343 ◽  
Author(s):  
O. Boser
Keyword(s):  
Solid Solution ◽  
Internal Friction ◽  
Dislocation Motion

DISLOCATION MOTION IN VA METALS STUDIED BY INTERNAL FRICTION

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-67-C5-72
Author(s):  
S. Okuda ◽  
H. Mizubayashi ◽  
N. Kuramochi ◽  
S. Amano ◽  
M. Shimada ◽  
...  
Keyword(s):  
Internal Friction ◽  
Dislocation Motion

INTERNAL FRICTION STUDIES ON HYDROGEN IN SOLID SOLUTION IN V-Nb ALLOYS

1985 ◽  
Vol 46 (C10) ◽  
pp. C10-107-C10-110
Author(s):  
C. V. OWEN ◽  
O. BUCK ◽  
R. R. SMITH ◽  
D. T. PETERSON
Keyword(s):  
Solid Solution ◽  
Internal Friction

EVIDENCE OF NONLINEAR DISLOCATION MOTION IN INTERNAL FRICTION EXPERIMENTS

1987 ◽  
Vol 48 (C8) ◽  
pp. C8-113-C8-117
Author(s):  
H.-J. KAUFMANN ◽  
P. P. PAL-VAL ◽  
V. M. CHERNOV ◽  
D. A. KAMAJEV
Keyword(s):  
Internal Friction ◽  
Dislocation Motion

High-Temperature Mechanical Relaxation due to Dislocation Motion inside Dislocation Networks

2008 ◽  
Vol 137 ◽  
pp. 21-28 ◽  
Author(s):  
Andre Rivière ◽  
Michel Gerland ◽  
Veronique Pelosin
Keyword(s):  
Internal Friction ◽  
Relaxation Effect ◽  
Dislocation Motion ◽  
Relaxation Peak ◽  
Mechanical Relaxation ◽  
In Situ Tem ◽  
Mechanical Spectroscopy ◽  
Internal Friction Peak ◽  
First Case ◽  
Dislocation Walls

Internal friction peaks observed in single or polycrystals are clearly due to a dislocation relaxation mechanism. Because a sample observed by transmission electron microscopy (TEM) often exhibits in the same time various dislocation microstructures (isolated dislocations, dislocation walls, etc.) it is very difficult to connect the observed relaxation peak with a particular dislocation microstructure. Using isothermal mechanical spectroscopy (IMS), it is easier to compare, for instance, the evolution of a relaxation peak with measurement temperature to the microstructural evolution observed by in-situ TEM at the same temperatures. IMS was used to study a relaxation peak in a 5N aluminium single crystal firstly 1% cold worked and then annealed at various temperatures. TEM experiments performed in the same material at various temperatures equal to the temperatures used for the damping experiments made possible to link this internal friction peak with a relaxation effect occurring inside dislocation walls. In two other experiments in a 4N aluminium polycrystal and in a metal matrix composite with SiC whiskers, it is shown that the observed relaxation peaks are connected to the motion of dislocations inside polygonization boundaries in the first case and in dislocation pile-ups around each whisker in the second one. Theoretical models proposed to explain such relaxation peaks due to a dislocation motion inside a dislocation wall or network are discussed.

Solid Solution Alloy Effects on Microstructure and Indentation Hardness in Pt-Ru Thin Films

2001 ◽  
Vol 673 ◽  
Author(s):  
Seungmin Hyun ◽  
Oliver Kraft ◽  
Richard P. Vinci
Keyword(s):  
Thin Films ◽  
Solid Solution ◽  
Elastic Moduli ◽  
Composition Range ◽  
Dislocation Motion ◽  
Solid Solution Alloy ◽  
Indentation Hardness ◽  
Solid Solution Strengthening ◽  
Si Substrates ◽  
Solution Strengthening

ABSTRACTThe elastic moduli and flow stresses of as-deposited Pt and Pt-Ru solid solution thin films were investigated by the nanoindentation method. The influence of solid solution alloying was explored by depositing Pt-Ru solid solution thin films with various compositions onto Si substrates. The 200 nm films were prepared by DC magnetron cosputtering with a Ru composition range from 0 to 20wt%. As expected, the modulus and the flow stress both increased significantly with an increase in Ru. The experimental results compare favorably to predictions based on a simple dislocation motion model consisting of three strengthening terms: substrate constraint, grain size strengthening and solid solution strengthening.

THE EFFECT OF DEFORMATION ON THE INTERNAL FRICTION OF IRON MEASURED AT THE CARBON PEAK POSITION

1959 ◽  
Vol 37 (12) ◽  
pp. 1474-1481 ◽  
Author(s):  
F. W. C. Boswell
Keyword(s):  
Solid Solution ◽  
Internal Friction ◽  
Strain Aging ◽  
Iron Carbide ◽  
Peak Position ◽  
Carbon Segregation ◽  
Aging Theory ◽  
Dislocation Densities ◽  
Carbide Particles ◽  
Carbon Peak

Experiments have been carried out to investigate the influence of deformation on the internal friction of iron measured at the carbon peak. As a result of deformation the internal friction increased and then decreased with time. These changes, corrected for a background change associated with the deformation, were shown to follow a time law predicted for carbon segregation to dislocations. It is concluded that the amount of carbon in random solid solution is increased by the deformation. By analyzing the rate of decrease of internal friction following deformation in terms of strain-aging theory the final dislocation densities were determined. The results also indicate that in some cases the carbon put into solution by the deformation was initially present in the form of iron carbide particles.

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