Strain amplitude dependence of the grain boundary internal friction peak of dilute aluminum alloys

1987 ◽  
Vol 100 (2) ◽  
pp. 453-459 ◽  
Author(s):  
K. Iwasaki
Keyword(s):  
Aluminum Alloys ◽  
Internal Friction ◽  
Grain Boundary ◽  
Strain Amplitude ◽  
Amplitude Dependence ◽  
Internal Friction Peak

Internal Friction during Reverse Martensitic Transformation in Mn-Cu Alloy with 45 % Mn

2013 ◽  
Vol 738-739 ◽  
pp. 183-186 ◽  
Author(s):  
Galina Viktorovna Markova ◽  
Ekaterina Sergeevna Klyueva
Keyword(s):  
Heat Treatment ◽  
Martensitic Transformation ◽  
Low Temperature ◽  
Internal Friction ◽  
Temperature Dependence ◽  
Strain Amplitude ◽  
Physical Mechanism ◽  
Amplitude Dependence ◽  
Internal Friction Peak ◽  
Cu Alloy

The temperature and amplitude dependence of internal friction fcc Mn45Cu55 alloy aged at 400 °C were studied. Two low-temperature internal friction peak observed in the quenched state. Physical mechanism of the peaks was determined by the effect of frequency and strain amplitude on the temperature dependence of internal friction. The influence of the heat treatment to the internal friction of the investigated alloy was shown.

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.

Internal Friction of Cast Graphite-Magnesium Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
J. H. Armstrong ◽  
S. P. Rawal ◽  
M. S. Misra
Keyword(s):  
Internal Friction ◽  
Strain Amplitude ◽  
Friction Model ◽  
Piezoelectric Composite ◽  
Amplitude Dependence ◽  
Friction Behavior ◽  
Dislocation Densities ◽  
The Matrix ◽  
Composite Strain ◽  
Zr Alloy

AbstractInternal friction behavior in cast 8-ply [0°1 P55Gr/Mg-0.6%Zr alloy and P55Gr/Mg-1%Mn composites as a function of vibratory strain amplitude was measured at 80 kHz using a Marxtype piezoelectric composite oscillator. Both the matrix and composite exhibited strain amplitude independent internal friction below ε ≈ 10−6, while significant strain amplitude dependence was noted at higher strain levels. A maxima in damping was observed for most of the specimens tested. Heat treatment to enlarge grain size was found to increase both the strain amplitude independent and dependent internal friction of the composite. Strain amplitude dependence of the internal friction, including the existence of the maxima, was explained by the Granato-Lucke (G-L) dislocation internal friction model. Dislocation densities obtained from various TEM images from the fiber-matrix interface were compared to values predicted by G-L theory.

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

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

Stress Relaxation Behavior of Cu-Ni-P Alloys Evaluated from Amplitude-Dependent Internal Friction

2012 ◽  
Vol 184 ◽  
pp. 245-250
Author(s):  
Yasuhiro Aruga ◽  
Yoshiki Morikawa ◽  
Satoshi Tamaoka ◽  
Yoichi Nishino
Keyword(s):  
Stress Relaxation ◽  
Plastic Strain ◽  
Internal Friction ◽  
Strain Amplitude ◽  
Annealing Time ◽  
Three Dimensional ◽  
Atom Probe ◽  
Dislocation Motion ◽  
Amplitude Dependence ◽  
Stress Relaxation Behavior

The strain-amplitude dependence of internal friction in Cu-0.41Ni-0.11P (mass%) alloys has been evaluated to reveal the relation between the amplitude-dependent internal friction and the stress relaxation performance. Annealing at 250°C after cold rolling causes a suppression of the strain-amplitude dependence with increasing annealing time in the range between 10 s and 104 s. Analysis of the amplitude-dependent internal friction reveals the plastic strain of the order of 10-9 as a function of effective stress on dislocation motion. It is found that the microflow stress at a constant level of plastic strain increases with increasing annealing time. This result is in line with the improvement in the stress relaxation performance but disagrees with a decrease in the tensile strength and yield stress after annealing. We believe that the increase in the microflow stress after annealing is caused by inhibition of dislocation motion due to Ni-P clusters, which were revealed by three-dimensional atom probe (3DAP) experiments.

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