VERY LOW FREQUENCIES INTERNAL FRICTION MEASUREMENTS OF ICE Ih

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-541-C5-546 ◽  
Author(s):  
J. Tatibouet ◽  
J. Perez ◽  
R. Vassoille
Keyword(s):  
Internal Friction ◽  
Low Frequencies ◽  
Friction Measurements

Anelastic Properties of Mg+3vol.%Gr Prepared by Ball Milling

2006 ◽  
Vol 319 ◽  
pp. 189-196
Author(s):  
Zuzanka Trojanová ◽  
Michael Bosse ◽  
Gerhard Ziegmann ◽  
Agnieszka Mielczarek ◽  
Hans Ferkel
Keyword(s):  
Internal Friction ◽  
Coefficient Of Thermal Expansion ◽  
Peak Position ◽  
Inert Atmosphere ◽  
Continuous Heating ◽  
Internal Friction Peak ◽  
Low Frequencies ◽  
The Matrix ◽  
The Difference ◽  
Friction Measurements

Internal friction in ultra-fine grained Mg with 3vol% of Graphite was measured by forced vibration method at low frequencies of 0.1, 0.5, 1.0, and 2.0 Hz over a temperature range from room temperature to 753 K with continuous heating. The specimens were prepared by milling procedure in an inert atmosphere and subsequent compacted and hot extruded. Two developed peaks in the internal friction spectrum were obtained at temperatures ≈ 350 K and ≈ 550 K. While the position of the first peak is frequency dependent, the second peak position is stable, independent of measuring frequency. The activation energy of the low temperature peak was estimated. In the light of internal friction measurements, the high temperature internal friction peak is attributed to the generation and motion of dislocations produced by the difference in the coefficient of thermal expansion between the Mg matrix and Gr phase at the matrix–particle interfaces.

STUDY OF THE Cu-Zn-Al MARTENSITE AGING BY INTERNAL FRICTION MEASUREMENTS

1987 ◽  
Vol 48 (C8) ◽  
pp. C8-567-C8-572
Author(s):  
M. MORIN ◽  
M. HAOURIKI ◽  
G. GUENIN
Keyword(s):  
Internal Friction ◽  
Friction Measurements

scholarly journals Internal Friction Measurements in Nb-0.3 wt. % Ti Containing Oxygen

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-135-C8-138 ◽  
Author(s):  
C. R. Grandini ◽  
L. E.C. Ferreira ◽  
H. R.Z. Sandim ◽  
O. Florêncio ◽  
H. Tejima ◽  
...  
Keyword(s):  
Internal Friction ◽  
Friction Measurements

High-Temperature Isothermal Internal Friction Measurements in NiCoCrAlY Alloys

M ◽  
2009 ◽  
pp. 447-447-10
Author(s):  
P Gadaud ◽  
A Rivière ◽  
J Woirgard
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Friction Measurements

Effect of Purity on Dislocation-Induced Relaxations in Molybdenum Single Crystals

2015 ◽  
Vol 363 ◽  
pp. 106-111
Author(s):  
Shigeru Suzuki ◽  
Alfred Seeger
Keyword(s):  
Internal Friction ◽  
Single Crystals ◽  
High Purity ◽  
Low Frequency ◽  
Activation Process ◽  
Dislocation Interaction ◽  
Dissolved Carbon ◽  
Dislocation Pinning ◽  
Friction Measurements ◽  
Substitutional Impurities

Dislocation-induced relaxations in different molybdenum single crystals were investigated by means of low-frequency internal friction measurements in the temperature range of 20–600 K. The results indicated that the appearance of the dislocation-induced relaxations strongly depends on the purity of the molybdenum, although the intrinsic dislocation relaxations appeared at about 100 K and 450 K in the high-purity molybdenum. The molybdenum containing a small amount of carbon did not exhibit the intrinsic dislocation relaxations but rather revealed a modulus increase due to the dislocation pinning caused by the dissolved carbon. When the molybdenum containing a small amount of carbon was annealed up to 700 K, a new relaxation peak appeared at about 450 K. The activation process for this relaxation indicated that it could be attributed to the relaxation due to a carbon-dislocation interaction. In addition, it was shown that the dislocation-induced relaxations in medium-purity molybdenum were small, which was attributed to the residual substitutional impurities in the molybdenum.

Sign in / Sign up

Export Citation Format

Share Document