First-principles study of grain boundary sliding inα−Al2O3

2007 ◽  
Vol 75 (18) ◽  
Author(s):  
Kaoru Nakamura ◽  
Teruyasu Mizoguchi ◽  
Naoya Shibata ◽  
Katsuyuki Matsunaga ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Grain Boundary ◽  
First Principles ◽  
Grain Boundary Sliding ◽  
First Principles Study ◽  
Boundary Sliding

Erratum: First-principles study of grain boundary sliding in α-Al2O3[Phys. Rev. B75, 184109 (2007)]

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
Kaoru Nakamura ◽  
Teruyasu Mizoguchi ◽  
Naoya Shibata ◽  
Katsuyuki Matsunaga ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Grain Boundary ◽  
First Principles ◽  
Grain Boundary Sliding ◽  
First Principles Study ◽  
Boundary Sliding ◽  
Α Al2o3

First-Principles Calculations of Grain Boundary-Surface for Various Grain Boundaries with Different Energies in Aluminum

2007 ◽  
Vol 551-552 ◽  
pp. 331-336 ◽  
Author(s):  
Tokuteru Uesugi ◽  
Y. Inoue ◽  
Yorinobu Takigawa ◽  
Kenji Higashi
Keyword(s):  
Shear Strength ◽  
Grain Boundary ◽  
First Principles ◽  
Boundary Surface ◽  
Grain Boundary Sliding ◽  
Excess Energy ◽  
First Principles Calculations ◽  
Perfect Single Crystal ◽  
Boundary Sliding ◽  
The Ideal

The grain boundary surface is the excess energy of the grain boundary as the lattice on one side of the grain is translated relative to the lattice on the other side of the grain. The maximum in the slope of the grain boundary surface determines the ideal shear strength for the grain boundary sliding. We presented the ideal shear strength for the grain boundary sliding in aluminum Σ3(11 2)[110] tilt grain boundary from the first-principles calculations. The ideal shear strength for the grain boundary sliding was much smaller than the ideal shear strength of a perfect single crystal.

First Principles Simulation of Grain Boundary Sliding

1996 ◽  
Vol 76 (8) ◽  
pp. 1284-1287 ◽  
Author(s):  
C. Molteni ◽  
G. P. Francis ◽  
M. C. Payne ◽  
V. Heine
Keyword(s):  
Grain Boundary ◽  
First Principles ◽  
Grain Boundary Sliding ◽  
Boundary Sliding

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.

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
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