Deformation of Polycrystalline MgO at High Hydrostatic Pressure

Autor:	S. V. Radcliffe, T. A. Auten
Rok vydání:	1976
Předmět:	Materials science Hydrostatic pressure Mineralogy Fracture mechanics law.invention Brittleness law Materials Chemistry Ceramics and Composites Crystallite Compression (geology) Hydrostatic equilibrium Composite material Dislocation Deformation (engineering)
Zdroj:	Journal of the American Ceramic Society. 59:249-253
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1976.tb10946.x
Popis:	Vacuum-hot-pressed MgO polycrystals were deformed in compression at hydrostatic pressures up to 1000 MPa in an effort to obtain gross plastic deformation at room temperature. Although transmission electron microscopy observations indicated an increase in dislocation density at pressures > 400 MPa, direct optical observations during deformation indicated that microfracturing persists as a mode of deformation throughout the stress-strain curves at even the highest test pressures. As in previous investigations, pressures > 400 MPa led to a transition from completely brittle to ductile behavior, as indicated by stress-strain plots, but direct optical observations suggested that the apparent transition is an effect of pressure on the mode of crack propagation.
Databáze:	OpenAIRE
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