The stress relaxation behavior of single-crystal MgO, single-crystal CaF2, and polycrystalline AgCl has been examined to assess if the assumption of constancy of structure during relaxation is valid. It is shown that structural change occurs in all three materials, being severe at small plastic strains in the case of MgO and CaF2. In polycrystalline AgCl, the structural change is due to recovery and increases with increasing plastic strain.
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Tangri et al. (1974) studied this question.
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