Grain Boundary Sliding Kinetics and Stress Relaxation Phenomena in Ni Alloys

1991 ◽  
Vol 229 ◽  
Author(s):  
F. Cosandey ◽  
S. Ui ◽  
B. Cao ◽  
R. Schaller ◽  
W. Benoit
Keyword(s):  
Stress Relaxation ◽  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Relaxation Phenomena ◽  
Ni Alloys ◽  
Boundary Sliding ◽  
Triple Points ◽  
Friction Measurements

AbstractInternal friction measurements have been performed on Ni-20 wt% Cr alloys containing trace additions of Ce ranging from 0 to 180 at ppm, in order to determine grain boundary sliding kinetics and associated stress relaxation phenomena. Two anelastic relaxation peaks have been observed corresponding to intrinsic grain boundary sliding between carbide precipitates and to macroscopic sliding with elastic accommodation at triple points. The effects of Ce on these grain boundary phenomena and resulting alloy ductilities are also presented.

INTERNAL FRICTION PEAKS CONNECTED WITH GRAIN BOUNDARY SLIDING IN Al

1983 ◽  
Vol 44 (C9) ◽  
pp. C9-759-C9-764
Author(s):  
E. Bonetti ◽  
A. Cavallini ◽  
E. Evangelista ◽  
P. Gondi
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Sliding

Fracture Toughness and Internal Friction of GlidCop®Al-25 Alloy

1998 ◽  
Vol 540 ◽  
Author(s):  
S. Tähtinen ◽  
M. Pyykkönen ◽  
S. Smuk ◽  
H. Hänninen ◽  
Y. Jagodzinski ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Interaction ◽  
Two Component ◽  
Temperature Component ◽  
Boundary Sliding ◽  
Increasing Temperature ◽  
Friction Study

AbstractFracture toughness was found to decrease rapidly with increasing temperature in dispersionstrengthened GlidCop®Al-25 copper alloy both in the as-supplied condition and neutron irradiated to a dose of 0.3 dpa. Internal friction study revealed two-component peak. Grain-boundary sliding was recognized to be responsible for the low-temperature component of the peak, which disappears after irradiation and restores after the heating above 900 K. This points out that the changes in the particle — grain boundary interaction, apparently, due to the defects at the interfaces produced by irradiation are responsible for the drop of fracture toughness in A125 alloy.

Internal friction effects due to grain boundary sliding in large- and small-grained aluminium

1994 ◽  
Vol 55 (10) ◽  
pp. 1157-1164 ◽  
Author(s):  
H.G. Bohn ◽  
M. Prieler ◽  
C.M. Su ◽  
H. Trinkaus ◽  
W. Schilling
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Sliding

Grain boundary sliding and non-constancy strain during stress relaxation of pure Mg

2021 ◽  
Vol 817 ◽  
pp. 141349
Author(s):  
Anand Varma ◽  
Aditya Gokhale ◽  
Hariharan Krishnaswamy ◽  
Dilip K. Banerjee ◽  
Jayant Jain
Keyword(s):  
Stress Relaxation ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Sliding

Particle blocking in grain boundary sliding and associated internal friction

1983 ◽  
Vol 31 (2) ◽  
pp. 275-283 ◽  
Author(s):  
T. Mori ◽  
M. Koda ◽  
R. Monzen ◽  
T. Mura
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Sliding

Effect of volume fraction of dispersed SiO2 particles on intermediate-temperature embrittlement in Cu–SiO2 polycrystals

1998 ◽  
Vol 13 (11) ◽  
pp. 3100-3105 ◽  
Author(s):  
Hiromi Miura ◽  
Taku Sakai ◽  
Günter Gottstein
Keyword(s):  
Stress Concentration ◽  
Stress Relaxation ◽  
Grain Boundary ◽  
Fracture Strain ◽  
Volume Fraction ◽  
Grain Boundary Sliding ◽  
Intermediate Temperature ◽  
Interfacial Diffusion ◽  
Fixed Temperature ◽  
Boundary Sliding

Several kinds of Cu polycrystals with dispersed SiO2 particles of different volume fractions were tensile tested at high temperatures from 473 K to 1023 K. All of the alloys showed clear intermediate-temperature embrittlement (ITE). Although the temperature of minimum elongation was almost the same in all the alloys, temperature dependence of fracture strain depended strongly on the SiO2 volume fraction: (1) At a fixed temperature, the fracture strain tended to first decrease with increase in SiO2 volume fraction, showed minimum in an alloy with certain volume fraction, and increased again with increase in volume fraction. (2) With increase in SiO2 volume fraction, the temperature range of ITE became narrower and sharper. These results were reasonably understood by considering the occurrence of stress concentration at grain-boundary particles induced by grain-boundary sliding (GBS) and occurrence of dynamic recrystallization and stress relaxation by Cu/SiO2 interfacial diffusion.

Influences of Annealing and Deformation on the High Temperature Internal Friction Spectra of Al-0.013%Wt Ce Alloy

2011 ◽  
Vol 197-198 ◽  
pp. 1573-1576
Author(s):  
Xiao Hui Cao ◽  
Shou Jing Wang
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Grain Boundary ◽  
Low Frequency ◽  
Grain Boundary Sliding ◽  
Boundary Sliding ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Two Peaks ◽  
Internal Friction Spectra

By using a low frequency inverted torsion pendulum, the high temperature internal friction spectra of Al-0.013wt%Ce alloy subjected to deformation at different tensile rates was measured, and three peaks, the conventional grain boundary peak (P1), the bamboo peak (P2) and the soild solution peak (P3) were found. Increases of annealing temperature and deformation rate make P1 and P2 lower with P1 shifting to higher temperature and P2 to lower temperature. P3 was only found in the as-received samples. The dependence of P1 and P2 on grain size indicates that the two peaks are originated from the grain boundary sliding, and P3 may be associated with the diffusion of Ce atoms or other impurities at grain boundaries.

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