scholarly journals A STUDY OF INTERNAL FRICTION ASSOCIATED WITH THE MARTENSITE TRANSFORMATION AT LOW FREQUENCY

1980 ◽  
Vol 29 (12) ◽  
pp. 1535
Author(s):  
WANG YE-NING ◽  
ZHOU YI-FENG ◽  
ZHANG ZHI-FANG
Keyword(s):  
Internal Friction ◽  
Martensite Transformation ◽  
Low Frequency

Effect of Heat Treatments on the Damping Characteristics of TiNi-Based Shape Memory Alloys

2006 ◽  
Vol 319 ◽  
pp. 33-38 ◽  
Author(s):  
I. Yoshida ◽  
Kazuhiro Otsuka
Keyword(s):  
Internal Friction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Frequency ◽  
Heat Treatments ◽  
Damping Capacity ◽  
Temperature Hysteresis ◽  
Temperature Spectrum ◽  
Two Peaks ◽  
Very High

Low frequency internal friction of Ti49Ni51 binary and Ti50Ni40Cu10 ternary shape memory alloys has been measured. The effect of solution and aging heat treatments on the damping property was examined. The temperature spectrum of internal friction for TiNi binary alloy consists, in general, of two peaks; one is a transition peak which is associated with the parent-martensite transformation and is rather unstable in a sense that it strongly depends on the frequency and decreases considerably when held at a constant temperature. The other one is a very high peak of the order of 10-2, which appears at around 200K. It appears both on cooling and on heating with no temperature hysteresis, and is very stable. The behavior of the peak is strongly influenced by the heat treatments. The trial of two-stage aging with a purpose of improving the damping capacity has been proved unsatisfactory. TiNiCu has a very high damping, the highest internal friction reaching 0.2, but by quenching from very high temperature, say 1373K, the damping is remarkably lowered. For the realization of high damping the quenching from a certain temperature range around 1173K seems the most preferable condition.

scholarly journals LOW FREQUENCY INTERNAL FRICTION OF MOVING MAGNETIC DOMAIN WALLS IN PURE IRON

1986 ◽  
Vol 35 (10) ◽  
pp. 1378
Author(s):  
Zhen Wen-guang ◽  
Zhang Jin-xiu ◽  
Lin Hao-qing ◽  
He Zhen-hui ◽  
Yao Yi-fa
Keyword(s):  
Internal Friction ◽  
Pure Iron ◽  
Domain Walls ◽  
Low Frequency ◽  
Magnetic Domain ◽  
Magnetic Domain Walls

scholarly journals Phase separation in La2NiO4+δ studied by lowfrequency internal friction technique

2004 ◽  
Vol 53 (11) ◽  
pp. 3834
Author(s):  
Zhang Hua-Li ◽  
Liu Wei ◽  
Li Dong-Cai ◽  
Wu Xiu-Sheng ◽  
Chen Chu-Sheng
Keyword(s):  
Phase Separation ◽  
Internal Friction ◽  
Low Frequency

Low-frequency internal friction in plastically deformed silicon crystals

1983 ◽  
Vol 26 (7) ◽  
pp. 616-618
Author(s):  
A. I. Drozhzhin ◽  
S. A. Antipov ◽  
A. N. Dmitriev
Keyword(s):  
Internal Friction ◽  
Low Frequency ◽  
Silicon Crystals

A Study on Influence of Annealing and Aging on High Temperature Internal Friction in Al-Zr Alloy

2012 ◽  
Vol 535-537 ◽  
pp. 1027-1030
Author(s):  
Xiao Hui Cao ◽  
Yu Wang
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Grain Boundary ◽  
Low Frequency ◽  
Grain Boundary Sliding ◽  
High Temperature Side ◽  
Internal Friction Peak ◽  
Average Grain Size ◽  
Lower Temperature ◽  
Zr Alloy

By using a low frequency inverted torsion pendulum, the high temperature internal friction spectra of Al-0.02wt%Zr and Al-0.1wt%Zr alloys were investigated respectively. In Al-0.02wt%Zr alloy, the conventional grain boundary internal friction peak (Pg) is observed with some small unstable peaks. In Al-0.1wt%Zr alloy, the bamboo peak is observed to appear at the high temperature side of the conventional grain boundary internal friction peak. The conventional grain boundary internal friction peak decreased and moved to higher temperature. The bamboo peak owns an activation energy of 1.75eV. When average grain size exceeded the diameter of samples, Pb strength was reduced and its position was shifted to a lower temperature. Based on the grain boundary sliding model, Pg and Pb peaks were explained. Their dependence on annealing temperature and time was determined by considering the effects of contained Ce atoms and other impurities on the relaxation across grain boundary.

Low-frequency internal friction of α+β titanium alloy SP-700

1999 ◽  
Vol 272 (1) ◽  
pp. 230-237 ◽  
Author(s):  
X.S. Guan ◽  
H. Numakura ◽  
M. Koiwa ◽  
K. Hasegawa ◽  
C. Ouchi
Keyword(s):  
Titanium Alloy ◽  
Internal Friction ◽  
Low Frequency
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