Effect of plastic deformation on the shape and parameters of the low-temperature peak of internal friction in niobium

1999 ◽  
Vol 25 (7) ◽  
pp. 558-565 ◽  
Author(s):  
V. D. Natsik ◽  
P. P. Pal-Val ◽  
L. N. Pal-Val ◽  
Yu. A. Semerenko
Keyword(s):  
Plastic Deformation ◽  
Low Temperature ◽  
Internal Friction ◽  
Temperature Peak

Search for High Damping Metallic Glasses

2006 ◽  
Vol 319 ◽  
pp. 151-156 ◽  
Author(s):  
Y. Hiki ◽  
M. Tanahashi ◽  
Shin Takeuchi
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Internal Friction ◽  
Metallic Glass ◽  
Room Temperature ◽  
Temperature Stability ◽  
Temperature Peak ◽  
High Temperature Side ◽  
Side Slope ◽  
Temperature Side

In a hydrogen-doped metallic glass, there appear low-temperature and high-temperature internal friction peaks respectively associated with a point-defect relaxation and the crystallization. The high-temperature-side slope of low-temperature peak and also the low-temperature-side slope of high-temperature peak enhance the background internal friction near the room temperature. A hydrogen-doped Mg-base metallic glass was proposed as a high-damping material to be used near and somewhat above the room temperature. Stability of the high damping was also checked.

Second Low-Temperature Peak in the Internal Friction of Aluminum

1959 ◽  
Vol 114 (5) ◽  
pp. 1273-1273 ◽  
Author(s):  
Edward Lax ◽  
Daniel H. Filson
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Temperature Peak

THE EFFECT OF HEAT TREATMENT ON LOW TEMPERATURE INTERNAL FRICTION MAXIMA

1958 ◽  
Vol 36 (1) ◽  
pp. 82-87 ◽  
Author(s):  
T. S. Hutchison ◽  
G. J. Hutton
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Melting Point ◽  
Low Temperature ◽  
Internal Friction ◽  
High Purity ◽  
Temperature Relation ◽  
Temperature Range ◽  
High Purity Aluminum

Measurements of the attenuation of sound at a frequency of 5 megacycles have been made over the temperature range 100° to 200 ° K. on polycrystalline high purity aluminum subjected to various thermal and mechanical treatments. With samples annealed at 520 °C. a maximum in the attenuation versus temperature relation had been observed at 155 ° K. This maximum was greatly increased by small amounts of plastic deformation of the order of 1.0 to 1.5%.Aluminum initially annealed for extended periods at temperatures much closer to the melting point shows, however, either no increase in the attenuation maximum at 155 ° K. or, in extreme cases, no maximum in this region at all, after plastic deformation of the same order as before. It is believed that this indicates a dependence of the deformation-induced maximum on the distribution and possibly on the number of dislocations in the metal prior to deformation and on the arrangement of the dislocations after deformation.

Fabrication and Damping Properties of Porous Cu

2012 ◽  
Vol 560-561 ◽  
pp. 1078-1083
Author(s):  
Jin Xiang Wang ◽  
Xiao Bo Peng
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Grain Boundaries ◽  
Mechanical Model ◽  
Damping Capacity ◽  
Temperature Peak ◽  
Damping Properties ◽  
Infiltration Process ◽  
Bulk Metal ◽  
Damping Behavior

The porous Cu specimens were prepared using infiltration process. Its damping behavior was investigated using multifunction internal friction apparatus over the temperature range from 40°C to 500°C.The size of macroscopic pore is in the order of a millimeter (1.0mm) and in large proportions, typically up to 60vol%. The measured IF (internal friction) shows that the damping capacity of porous Cu is higher than that of its bulk metal. It’s found that two IF peaks present at the internal friction against temperature curves at around 280°C and 400°C.The high-temperature arises from the relaxation of grain boundaries. The low-temperature peak may origin from the interaction of dislocation and grain boundaries. TEM observations showed the dislocation substructures exist in the porous Cu. Based on the observed experimental phenomena, a four-parameter mechanical model was used for describing the operative damping mechanism of the low-temperature peak in the porous Cu specimen.

LOW TEMPERATURE INTERNAL FRICTION OF COLD WORKED ZIRCONIUM

1971 ◽  
Vol 32 (C2) ◽  
pp. C2-209-C2-213 ◽  
Author(s):  
E. J. SAVINO ◽  
E. A. BISOGNI
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Cold Worked
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