Abstract
The solution strengthening of MgO by dissolved transition metal cations is examined. Trivalent cations, Al3+, Cr3+, and Fe3+ harden MgO equally, while divalent cations Fe2+ and Ni2+ have little effect upon yield strength. The strengthening is inconsistent with the elastic theory of Fleischer for pinning of dislocations at tetragonal defects. The solution hardening by Al3+, Cr3+, and Fe3+ is quantitatively explained by a recent theory by Gilman. Strengthening in this theory results from the change in electrostatic energy that occurs when a trivalent ion−pair−cation−vacancy complex is sheared by a dislocation passing through the complex.
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