Strength of MgO and NaCl polycrystals to confining pressures of 250 kbar at 25 °C
- 1 March 1977
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 48 (3) , 978-985
- https://doi.org/10.1063/1.323719
Abstract
The strengths of MgO and NaCl polycrystals under confining pressures to 250 kbar have been determined in a diamond‐anvil high‐pressure cell. The stresses in the samples are inferred from the strains determined by x‐ray diffraction. The strength of MgO polycrystals is found to rise from a 1‐bar confining pressure value of about 4 kbar to a maximum of 30±10 kbar at a pressure of 50±20 kbar and to remain constant at that value to a pressure of 250 kbar. The strength of NaCl polycrystals is found to rise from a 1‐bar confining pressure value of about 0.3 kbar to a maximum of 4.0±1.5 kbar at a confining pressure of 250 kbar. The interpretation of the form of strength versus pressure for these two compounds is discussed in terms of a brittle‐ductile transition. Preliminary transmission electron microscope data are presented.This publication has 13 references indexed in Scilit:
- Estimation of uniaxial stress component in NaCl samples compressed in a tungsten carbide anvil high-pressure x-ray apparatusJournal of Applied Physics, 1976
- Modification of the diamond cell for measuring strain and the strength of materials at pressures up to 300 kilobarReview of Scientific Instruments, 1976
- Uniaxial stress component in tungsten carbide anvil high-pressure x-ray camerasJournal of Applied Physics, 1974
- Pressure Dependence of the Elastic Constants of NaCl at Low TemperaturesJournal of Applied Physics, 1970
- Deformation of Polycrystalline MgO Under PressureJournal of the American Ceramic Society, 1970
- Equation of state of polycrystalline and single-crystal MgO to 8 kilobars and 800°KJournal of Geophysical Research, 1970
- Pressure Dependence of the Plastic Flow Stress of Alkali Halide Single CrystalsJournal of Applied Physics, 1968
- Kinking in MgO single crystals under high confining pressurePhilosophical Magazine, 1967
- Deformation of Polycrystalline MgO at Elevated TemperaturesJournal of the American Ceramic Society, 1965
- Effect of Crystal Orientation on Plastic Deformation of Magnesium OxideJournal of the American Ceramic Society, 1963