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

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.

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

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

Low Temperature Internal Friction of Diamond-Like Carbon Films

2002 ◽  
Author(s):  
Xiao Liu ◽  
D. M. Photiadis ◽  
J. A. Bucaro ◽  
J. F. Vignola ◽  
B. H. Houston ◽  
...  
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Carbon Films ◽  
Diamond Like Carbon

Early-life temperature modifies adult encapsulation response in an invasive ectoparasite

Parasitology ◽  
2015 ◽  
Vol 142 (10) ◽  
pp. 1290-1296 ◽  
Author(s):  
SIRPA KAUNISTO ◽  
LAURA HÄRKÖNEN ◽  
MARKUS J. RANTALA ◽  
RAINE KORTET
Keyword(s):  
Climate Change ◽  
High Temperature ◽  
Low Temperature ◽  
Blood Feeding ◽  
Life Cycles ◽  
Extreme Weather Events ◽  
Favourable Effect ◽  
Temperature Peak ◽  
Long Term Effects ◽  
High Temperature Peak

SUMMARYImmunity of parasites has been studied amazingly little, in spite of the fact that parasitic organisms, especially the arthropod parasites, need immunity to survive their own infections to successfully complete life cycles. Long-term effects of challenging environmental temperatures on immunity have remained unstudied in insects and parasites. Our study species, the deer ked (Lipoptena cervi; Linnaeus 1758), is an invasive, blood-feeding parasitic fly of cervids. Here, it was studied whether thermal stress during the pupal diapause stage could modify adult immunity (encapsulation capacity) in L. cervi. The effect of either a low temperature or high temperature peak, experienced during winter dormancy, on encapsulation response of active adult was tested. It was found that low temperature exposure during diapause, as long as the temperature is not too harsh, had a favourable effect on adult immunity. An abnormal, high temperature peak during pupal winter diapause significantly deteriorated the encapsulation capacity of emerged adults. The frequency and intensity of extreme weather events such as high temperature fluctuations are likely to increase with climate change. Thus, the climate change might have previously unknown influence on host-ectoparasite interactions, by affecting ectoparasite's immune defence and survival.

Internal-friction and elastic-modulus anomalies of copper-2.1 at. % iron alloy at low temperature

1976 ◽  
Vol 33 (1) ◽  
pp. 338-344 ◽  
Author(s):  
J. M. Pelletier ◽  
R. Borrelly ◽  
P. F. Gobin
Keyword(s):  
Elastic Modulus ◽  
Low Temperature ◽  
Internal Friction ◽  
Iron Alloy

scholarly journals A Study on the Low Temperature Internal Friction Relaxation Peak in a Ti49.8Ni50.2 Alloy

2006 ◽  
Vol 47 (3) ◽  
pp. 711-715 ◽  
Author(s):  
Shyi-Kaan Wu ◽  
Hsin-Chih Lin ◽  
Tung-Sheng Chou
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Relaxation Peak
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