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- W2058099715 abstract "Synthetic polycrystalline halite (rocksalt) has been deformed in uniaxial compression in the temperature range 250–780°C (0.5−0.98 Tm) at strain rates between 10−3 and 10−7 s−1. Constant strain rate and strain-rate decrement, increment and cycling tests have been carried out. At temperatures from 250 to 450°C, the steady-state flow law is given by ⋗e= 5.75 × exp(−129/RT)σ5.7, which is thought to describe climb-controlled dislocation creep, in which climb is controlled by diffusion through dislocation cores (pipe diffusion). The flow law in the temperature range 500–780°C is given by ⋗e = 6.57 × 107exp(−227/RT)σ4.4), which is inferred to describe lattice diffusion-controlled dislocation creep. In the temperature range 250–350°C, polygonization and rotation recrystallization are the dominant microstructural processes. However, with increasing temperature, grain boundary migration becomes important. The transition to migration recrystallization-dominated microstructures, at c. 450°C, coincides with the change from pipe diffusion- to lattice diffusion-controlled creep. This is explained as due to relative changes of grain-boundary mobility, nucleation rate and driving force, which allow a balance to be established between the migration rate of nucleated grains and the nucleation rate of new grains. Below 450°C, the strain-rate history has a profound effect upon the observed microstructural development and mechanical behaviour. The subgrains do not increase and the stresses do not fall to the expected steady-state values upon a lowering in strain rate. This process of subgrain refinement results in relative hardening effects and in an increase of the stress sensitivity upon strain rate up to 10. Above 450°C, however, the strain-rate history does not affect the microstructural development and steady-state behaviour is always attained because migration recrystallization resets the microstructure which adjusts to the newly imposed conditions. The crystallographic preferred orientation under all conditions investigated is characterised by rotation of the {110} poles towards the compression direction. Recrystallization processes appear to have no influence on the texture development." @default.
- W2058099715 created "2016-06-24" @default.
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- W2058099715 date "1994-05-01" @default.
- W2058099715 modified "2023-09-27" @default.
- W2058099715 title "The rheology of synthetic rocksalt in uniaxial compression" @default.
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- W2058099715 doi "https://doi.org/10.1016/0040-1951(94)90218-6" @default.
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