EFFECTS OF A BOUNDARY NODE ON GRAIN-BOUNDARY SLIDING AND INTERGRANULAR FRACTURE IN Cu-9at.%Al TRICRYSTALS

1990 ◽  
Vol 51 (C1) ◽  
pp. C1-587-C1-592
Author(s):  
S. MIURA ◽  
T. OKADA ◽  
S. ONAKA ◽  
S. HASHIMOTO
Keyword(s):  
Grain Boundary ◽  
Intergranular Fracture ◽  
Grain Boundary Sliding ◽  
Boundary Node ◽  
Boundary Sliding

Suppression of grain-boundary sliding by a boundary node in Cu-9at.%A1 tricrystals

1989 ◽  
Vol 23 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Tatsuya Okada ◽  
Susuma Onaka ◽  
Satoshi Hashimoto ◽  
Sei Miura
Keyword(s):  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Boundary Node ◽  
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
Sign in / Sign up

Export Citation Format

Share Document