HIGH TEMPERATURE STRESS-STRAIN BEHAVIOR OF MgO IN COMPRESSION
Journal Article
·
· American Ceramic Society
Compressive stress-strain curves for several types of polycrystalline MgO specimens were correlated with those for single crystals and analyzed as a function of grain size and grain-boundary character at 1200 and 1400 C for several strain rates. The results for fully dense specimens were explained in terms of grain-boundary sliding and intergranular separation in addition to slip. The modification of grain-boundary nature concurrent with heat treatment for grain growth, caused by residual LUF, was associated with enhanced grain-boundary sliding and intergranular separation. For grain sizes <30 {micro}m, it was concluded that the von Miss criteria for ductility could be relaxed by the Occurrence of dislocation climb and, to a limited extent, by intergranular separation. Yield drop corresponding to dislocation multiplication occurred when grain-boundary sliding was initially promoted. Specimens with a liquid phase of adequate viscosity also indicated plasticity accompanied by high strength. Specimens with clean grain boundaries exhibited ductility and normal strain hardening with no intergranular separation.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Chemical Sciences Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1004887
- Report Number(s):
- LBL-6993-Rev.
- Journal Information:
- American Ceramic Society, Journal Name: American Ceramic Society Journal Issue: 9-10 Vol. 62; ISSN 0002-7820; ISSN 1551-2916
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-temperature stress-strain behavior of MgO in compression
High temperature deformation of MgO
Strain softening mechanism at meso scale during micro-compression in an ultrafine-grained pure copper
Conference
·
Sat Sep 01 00:00:00 EDT 1979
· J. Am. Ceram. Soc.; (United States)
·
OSTI ID:5643485
High temperature deformation of MgO
Technical Report
·
Fri Oct 31 23:00:00 EST 1975
·
OSTI ID:7357409
Strain softening mechanism at meso scale during micro-compression in an ultrafine-grained pure copper
Journal Article
·
Tue Sep 15 00:00:00 EDT 2015
· AIP Advances
·
OSTI ID:22492356