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 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

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 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.

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

The Influence of Second Particals on Grain Boundary Sliding

2014 ◽  
Vol 988 ◽  
pp. 49-55
Author(s):  
Jian Qiang Zhang ◽  
Jun Zhang ◽  
Guo Sen Zhu ◽  
Yan Jun Zheng ◽  
Shao Wei Li ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Grain Boundary ◽  
Slow Rate ◽  
Secondary Electron ◽  
Ambient Pressure ◽  
Grain Boundary Sliding ◽  
Nucleation Sites ◽  
Second Phases ◽  
Boundary Sliding ◽  
Boundary Deformation

The effect of second particles on the grain boundary deformation in 304 type austenitic stainless steel was studied. Flat tensile samples with marker scratches on the surface were strained at slow rate at intermediate temperatures (300-500 °C) at ambient pressure. It seems that the sensitized material decreased creep rate and needed more stress to generate deformation of grain boundary, suggesting Cr carbides decreased the grain boundary sliding. Thus, the resistance to SCC crack propagation could be improved. The Charpy tests suggested that sensitized material had lower fracture toughness; this was due to the GB carbides that acted as nucleation sites for brittle fracture. Characterizations of the tensile samples were carried out using a secondary electron microscope in order to understand whether second phases can affect the creep behavior and grain boundary sliding.

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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