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- W2135957230 abstract "Artificially prepared specimens of bischofite (MgCl2-6H2O) have been experimentally deformed at temperatures between 20 and 100°C, strain rates between 10−4 and 10−88 s−1, and confining pressures between 0.1 and 28 MPa. Development of microstructure with strain was studied by in-situ deformation experiments, and results of these were correlated with observations made on thin sections of deformed samples. In a first series of experiments the effect of grain size, impurity content and water content on the flow behaviour was investigated. Addition of about 0.1 wt.% water to dry samples was found to decrease the flow stress by a factor of 5. This effect was found to be associated with the formation of a thin fluid film on grain boundaries, strongly enhancing dynamic recrystallization due to the movement of high-angle grain boundaries, and possibly also to enhanced intracrystalline plasticity due to excess water present in the lattice. In a second series of experiments the strain-rate sensitivity of the flow stress of selected samples was investigated. Two regimes could be distinguished: one with a stress exponent n = 4.5 in the power law creep equation for values of the differential stress above 2.0 MPa, and one with n = 1.5 for stresses below this value. The main deformation mechanisms were intracrystalline slip, twinning, and grain-boundary sliding. Recrystallization occurred by subgrain rotation and high-angle grain-boundary migration. The rates of grain-boundary migration fell into two different regimes, one regime being distinguished by extremely fast migration rates. The applicability of the experimentally found flow law to the behaviour of bischofite rocks in nature is discussed." @default.
- W2135957230 created "2016-06-24" @default.
- W2135957230 creator A5035446979 @default.
- W2135957230 date "1983-04-01" @default.
- W2135957230 modified "2023-10-18" @default.
- W2135957230 title "Water assisted dynamic recrystallization and weakening in polycrystalline bischofite" @default.
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- W2135957230 doi "https://doi.org/10.1016/0040-1951(83)90247-0" @default.
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