Internal friction behavior of an unidirectionally solidified Al2O3/YAG eutectic at high temperature

2007 ◽  
Vol 33 (8) ◽  
pp. 1569-1571 ◽  
Author(s):  
Satoshi Takata ◽  
Shunkichi Ueno ◽  
Yasuhiro Tanabe ◽  
Takashi Akatsu ◽  
Eiichi Yasuda ◽  
...  
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Friction Behavior

High Temperature Internal Friction Behavior of Unidirectionally Solidified Al2O3/YAG Eutectic

2010 ◽  
Vol 638-642 ◽  
pp. 2482-2486
Author(s):  
Shunkichi Ueno ◽  
Satoshi Takata ◽  
Yasuhiro Tanabe ◽  
Takashi Akatsu ◽  
Eiichi Yasuda ◽  
...  
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Internal Friction ◽  
Single Crystal ◽  
Apparent Activation Energy ◽  
Elevated Temperatures ◽  
Torsional Loading ◽  
Friction Behavior

In this paper, the internal friction behaviors of unidirectionally solidified Al2O3/YAG eutectic that are examined by the authors in passed several years are reviewed. The internal friction of this eutectic increased with increasing temperatures above 1200oC. The apparent activation energy of the eutectic sample in the range from 1100 to 1400oC was same to that of Al2O3 single crystal. Above 1200oC, the internal friction of this material drastically increased with increasing temperatures. The magnitude of the internal friction strongly depended on the elevated temperatures and the cycle numbers of the torsional loading. For the 1400oC test, the internal friction gradually increased with the loading cycles and then saturated by 103 times of the loading cycles.

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.

scholarly journals Fabrication and High Temperature Friction Behavior and Oxidation Resistance of Ni-Co-ZrO2 Composite Coating

2016 ◽  
Vol 19 (3) ◽  
pp. 562-571 ◽  
Author(s):  
Wan-chang Sun ◽  
Jia-wei Gu ◽  
Pei Zhang ◽  
Miao-miao Tian ◽  
Ying Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Oxidation Resistance ◽  
Friction Behavior

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.

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
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