On the grain boundary internal friction peak of ?-brasses

1990 ◽  
Vol 25 (1) ◽  
pp. 519-521
Author(s):  
Z. M. Farid ◽  
S. Saleh ◽  
S. A. Mahmoud
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Internal Friction Peak

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.

scholarly journals The Internal Friction of Single Crystals, Bicrystals and Polycrystals of Pure Magnesium

2015 ◽  
Vol 60 (1) ◽  
pp. 371-375 ◽  
Author(s):  
W.B. Jiang ◽  
Q.P. Kong ◽  
L.B. Magalas ◽  
Q.F. Fang
Keyword(s):  
Activation Energy ◽  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Room Temperature ◽  
Internal Friction Peak ◽  
Self Diffusion ◽  
Boundary Relaxation ◽  
The Difference

Abstract The internal friction of magnesium single crystals, bicrystals and polycrystals has been studied between room temperature and 450°C. There is no internal friction peak in the single crystals, but a prominent relaxation peak appears at around 160°C in polycrystals. The activation energy of the peak is 1.0 eV, which is consistent with the grain boundary self-diffusion energy of Mg. Therefore, the peak in polycrystals can be attributed to grain boundary relaxation. For the three studied bicrystals, the grain boundary peak temperatures and activation energies are higher than that of polycrystals, while the peak heights are much lower. The difference between the internal friction peaks in bicrystals and polycrystals is possibly caused by the difference in the concentrations of segregated impurities in grain boundaries.

Effect of neutron irradiation on the grain boundary internal friction peak

1972 ◽  
Vol 20 (3) ◽  
pp. 469-471 ◽  
Author(s):  
S.K Bose ◽  
R Mishra ◽  
D.L Bhattacharya
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Neutron Irradiation ◽  
Internal Friction Peak

A comparative study on the grain boundary internal friction peak of pure iron

2021 ◽  
Vol 305 ◽  
pp. 130814
Author(s):  
Meng Sun ◽  
Weibin Jiang ◽  
Xueqing Liu ◽  
Tianlu Chen ◽  
Xianping Wang ◽  
...  
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Comparative Study ◽  
Pure Iron ◽  
Internal Friction Peak
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