Low-temperature dislocation absorption of ultrasound in high-purity α-iron single crystals. Effect of Peierls barriers and impurities on dislocation motion

1987 ◽  
Vol 56 (3) ◽  
pp. 407-418 ◽  
Author(s):  
P. P. Pal-Val ◽  
V. D. Natsik ◽  
S. Kadečková
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
High Purity ◽  
Dislocation Motion

Low-temperature dislocation relaxations in high-purity iron single crystals deformed at 295 and 78 K

1988 ◽  
Vol 105 (1) ◽  
pp. K37-K40 ◽  
Author(s):  
P. P. Pal-Val ◽  
V. D. Natsik ◽  
S. Kadečková
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
High Purity ◽  
Purity Iron ◽  
High Purity Iron

Low-Temperature Anomalies of Ultrasound and Velocity in High-Purity Niobium Single Crystals

1993 ◽  
Vol 119-121 ◽  
pp. 117-124 ◽  
Author(s):  
P.P. Pal-Val ◽  
V.D. Natsik ◽  
H.-J. Kaufmann ◽  
Alla S. Sologubenko
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
High Purity ◽  
Temperature Anomalies

Internal Friction in Plastically Deformed High-Purity NiAl Single Crystals

1998 ◽  
Vol 552 ◽  
Author(s):  
M. Hirscher ◽  
D. Schaible
Keyword(s):  
Internal Friction ◽  
Single Crystals ◽  
High Purity ◽  
Formation Enthalpy ◽  
Dislocation Motion ◽  
Zone Melting ◽  
Interstitial Impurity ◽  
Impurity Atoms ◽  
Kink Pair ◽  
Friction Measurements

ABSTRACTHigh-purity stoichiometric NiAl single crystals have been prepared by crucible-free inductive zone melting and afterwards well annealed at temperatures below 1200 K. Internal friction measurements of torsionally deformed single crystals show two relaxation maxima at 500 and 800 K which anneal during the measurement. The first maximum can be assigned to the dislocation motion by kinkpair formation and the annealing to pinning of these dislocations by interstitial impurity atoms. The second maximum is attributed to the Snoek-Köster relaxation of dislocations in the presence of mobile interstitial impurity atoms and the annealing to the pinning of dislocations by vacancies. The kink-pair formation enthalpy in NiAl was estimated.

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