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 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

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.

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

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