Snoek Relaxation in Fe-Cr Alloys (O to 100%Cr)

2009 ◽  
pp. 278-278-10
Author(s):  
IS Golovin ◽  
MS Blanter ◽  
A Mourisco ◽  
R Schaller
Keyword(s):  
Snoek Relaxation

scholarly journals The Hydrogen Influence upon Oxygen Snoek Relaxation in Nb-Ti Alloys

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-107-C8-110
Author(s):  
I. S. Golovin ◽  
M. S. Blanter ◽  
A. V. Vasiliev
Keyword(s):  
Ti Alloys ◽  
Snoek Relaxation

Ab Initio Based O-O Investigation and the Snoek Relaxation in Nb-O

2012 ◽  
Vol 184 ◽  
pp. 63-68 ◽  
Author(s):  
M.S. Blanter ◽  
V.V. Dmitriev ◽  
Andrei V. Ruban
Keyword(s):  
Ab Initio ◽  
Interstitial Atom ◽  
Common Knowledge ◽  
Published Data ◽  
Range Interaction ◽  
Debye Function ◽  
Atom Concentration ◽  
Interstitial Atoms ◽  
The Impact ◽  
Snoek Relaxation

t is common knowledge that interstitial-interstitial interaction influence on the Snoek relaxation. We used a computer simulation of this effect in the Nb-O alloy to test the adequacy of various models of the O-O interaction and clarify the mechanism of this effect The energy calculations in the first twelve coordination shells have been performed by the projector augmented-wave (PAW) method as implemented in the Viennaab initiosimulation package (VASP). The energies have been calculated in different ways which vary in the method of determination the energy of non-interacting O-O pairs. The energies calculated on the various variants are similar but in one case there is O-O repulsion in all first twelve coordination shells, whereas in another one can see attraction in four of twelve shells. Internal frictionQ-1was calculated as a sum of the contributions from individual interstitial atoms in different environments, each of which being assumed to be the Debye function. It is assumed that long-range interaction of oxygen atoms affects the distribution of these atoms and the energy of each interstitial atom in the octahedral interstices before a jump and after a jump. The Monte Carlo method is used for simulating short-range order of interstitial atoms and for calculating values of energy changes. Comparison of the calculated temperature and concentration dependence of the Snoek peak with the published data showed that the PAW supercell calculation of the O-O interactions in Nb describes the behavior of the interstitial solid solution adequately. It proves also that the impact of interstitial atom concentration on the Snoek relaxation is connected to the mutual attraction of these atoms.

Ab initio based investigation of interstitial interactions and Snoek relaxation in Nb–O

2012 ◽  
Vol 73 (2) ◽  
pp. 182-187 ◽  
Author(s):  
V.V. Dmitriev ◽  
M.S. Blanter ◽  
A.V Ruban ◽  
B. Johansson
Keyword(s):  
Ab Initio ◽  
Snoek Relaxation

Study on Damping Capacities of Nodular Cast Iron Dense Bar Produced by Horizontal Continuous Casting

2011 ◽  
Vol 399-401 ◽  
pp. 250-253
Author(s):  
Zhong Ming Zhang ◽  
Jin Cheng Wang ◽  
Chun Jie Xu ◽  
Wei Ming Li ◽  
Gang Wang
Keyword(s):  
Cast Iron ◽  
Internal Friction ◽  
Continuous Casting ◽  
Nodular Cast Iron ◽  
Damping Capacity ◽  
Temperature Dependent ◽  
Horizontal Continuous Casting ◽  
Increasing Temperature ◽  
Snoek Relaxation ◽  
Superposition Effect

Damping capacities of the annealed nodular cast iron dense bar produced by horizontal continuous casting were measured by Dynamic Mechanical Analyzer. The relation of damping capacities with vibration amplitude, frequency and temperature was analyzed to investigate the damping mechanism of the alloy. The results show that the damping capacities increase with increasing temperature and frequency. The internal friction spectra exhibits two internal friction peaks at about 40°C and 150°C and caused by Snoek relaxation and Snoek-Köster relaxation, respectively. The maximum damping capacity can be obtained at about 63Hz. The damping is positive amplitude-dependent, whereas critical amplitude exists where the damping increases dramatically. The temperature-dependent damping results from the superposition effect of point-defect damping, grain boundary damping and interface damping, while dislocation damping is predominant in the frequency dependent damping. The amplitude dependent damping can be interpreted by G-L theory.

scholarly journals The Snoek Relaxation in Dilute Ternary bcc Alloys. A Review

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-97-C8-106 ◽  
Author(s):  
H. Numakura ◽  
M. Koiwa
Keyword(s):  
Snoek Relaxation

The nitrogen snoek relaxation in molybdenum

1984 ◽  
Vol 98 (1) ◽  
pp. 33-44 ◽  
Author(s):  
G. Haneczok ◽  
T. Poloczek ◽  
J.W. Moroń
Keyword(s):  
Snoek Relaxation
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