Yield strength and strain hardening of MgO up to 8 GPa measured in the deformation-DIA with monochromatic X-ray diffraction

Abstract Cylindrical polycrystalline MgO samples have been deformed with total axial strains up to 35% at pressures up to 8 GPa. Hysteresis loops between elastic lattice strain and total axial strain were established by repeatedly shortening and lengthening the samples at selected strain rates. The yield point was identified as the first deviation from linearity in the lattice strain versus total strain curves. MgO samples yielded at low total strains (

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