THE ROLE OF THE GRAIN BOUNDARY IN THE DEFORMATION OF CERAMIC MATERIALS
Technical Report
·
OSTI ID:4659323
The grain boundaries of MgO bicrystal specimens were subjected to creep- rupture tests in the temperature range of 1300 to 15O0 deg C and at shear stresses varying from 150 to 10,000 gm/sq. mm. The boundary was oriented at 45 deg to the compression direction. The stress for grain boundary sliding and fracture varied markedly with crystal misorientation; high twist-low tilt boundaries were much weaker than other misorientations. For a given misorientation there was considerable scatter in the fracture and sliding stress data which was found to be a result of boundary irregularities (jog content) present in the as-received material or stress-induced during test. Most specimens did not exhibit controlled grain boundary sliding but, rather, would slide uncontrollably to fracture after an incubation period of a few minutes at a critical stress. (auth)
- Research Organization:
- Materials Research Corp., Orangeburg, N.Y.
- NSA Number:
- NSA-17-037504
- OSTI ID:
- 4659323
- Report Number(s):
- ASD-TDR-62-225; AD-295551
- Country of Publication:
- United States
- Language:
- English
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