Abstract
Single crystalline samples of sodium and silver chloride, have been crept at high temperature ( T > 0.5 T m ). It is shown that Hart's analysis of plastic deformation without recovery, can be extended in the case of transient, recovery-controlled creep of sodium and silver chloride. The region on the right of the minimum creep rate curve on the log σ — log ⋗e diagram corresponds to transient creep states with unstable substructure. It has been found theoretically and verified experimentally that the initial strain rate. ge i , of a sample precept at σ 1 after a stress increase σ 0 = σ 2 − σ 1, is a function of the stress σ 1 and the associated secondary strain rate ge s1 : ge i = ( σ 2 σ 1 ) nge s1 The exponent n, is the strain rate sensitivity of the stress at constant structure introduced by Hart. We found: n = 7.3 ± 0.3 for sodium chloride: n = 6.1 ± 0.3 for silver chloride.
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