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- W2078963415 abstract "Abstract Interaction profiles between edge or screw dislocations and elastic dipoles are calculated as the temperature dependence of the flow stress t associated with these profiles. The variation of the flow stress with temperature T can be written as τ = τ 0 [1 − (T/T c ) 1 2 ] q/p with q/p = 3 2 for edge dislocations and q/p = 3 or 2 for screw dislocations. τ0 is the flow stress extrapolated at 0K and Tc is the temperature at which the hardening is not thermally activated. Flow stress measurements as a function of temperature are analysed and it is shown that the same set of experimental data can be adjusted on a straight line in various diagrams τp/q− Tr. Therefore, the observation of a linear relationship in a given diagram is not a sufficient criterion to determine the hardening mechanism. A new criterion is proposed where, besides the linearity the agreement between theoretical and experimental values of τ0 obtained for various types of interaction is considered. The method is used to study the case of LiF: Mg2+ and it is found that the hardening results from the interaction between edge dislocations and impurity-vacancy dipoles. For this interaction the theoritical flow stress of ionic crystals doped with divalent impurities decreases when the polarisability of the host-crystal increases as observed experimentally." @default.
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- W2078963415 date "1983-08-01" @default.
- W2078963415 modified "2023-10-16" @default.
- W2078963415 title "Temperature dependence of hardening by tetragonal distortions: Divalent impurity doped ionic crystals" @default.
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- W2078963415 doi "https://doi.org/10.1016/0001-6160(83)90180-3" @default.
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