Effect of Impurities on the Mechanical Behavior of MgO Single Crystals
- 1 August 1970
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 41 (9), 3726-3730
- https://doi.org/10.1063/1.1659499
Abstract
The effect of impurities on the critical resolved shear stress (CRSS) of magnesium oxide single crystals has been determined using compression testing in crystals containing up to 40 mole ppm Fe3+ and up to 500 mole ppm of Ni+2 impurities. In pure crystals containing small amounts of Fe2+, the value of 0.73±0.07 kg/mm2 is determined as the CRSS, and two distinguishable strain hardening regions are identified. The effect on CRSS on Fe3+ content and of isochronal and isothermal aging is also studied; precipitation hardening is observed on aging even for very low concentrations of Fe3+. Heat treatments have very little effect on Ni+2‐doped crystals, and yielding studies show that Fe3+ is much more significant than Ni2+ in hardening MgO.Keywords
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