Water-enhanced dynamic recrystallization and solution transfer in experimentally deformed carnallite

Urai, János L.

doi:10.1016/0040-1951(85)90055-1

Cited by 49 publications

(29 citation statements)

References 19 publications

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“…Keeping in mind the absence of confining pressure in the present experiments, the microstructural development observed is in good agreement with the microstructures found in carnallite deformed in a triaxial apparatus (Urai, 1985). In both cases, dry samples deformed by intracrystalline slip and twinning, accompanied by cataclasis.…”

Section: Discussionsupporting

confidence: 74%

“…Becau e the tarting material in the pre ent experiment con isted of ingle cry tal , grain boundary 37 59 129 migration tarted operating at higher train than in the polycrystalline ample de cribed in Urai (1985), where high-angle grain boundaries were Observations on bischofite present in the starting material. As was argued in Urai (1985), the reason for the difference in behaviour between samples deformed with and without brine is thought to be a slight change in H 2 0 concentration in the carnallite lattice, and the presence of thin brine films on grain boundaries. It should also be noted that, in addition to the higher temperatures, the presence of relatively short diffusion paths (because thin samples with a relatively rough surface were used in the present experiments), may explain the presence of twin boundary migration in the relatively fast see-through runs.…”

Section: Discussionmentioning

confidence: 99%

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Development of microstructure during deformation of carnallite and bischofite in transmitted light

1987

International Journal of Rock Mechanics and Mining Sciences &am

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During deformation of 5 X 5 X 0.1 mm samples of carnallite and bischofite in transmitted light, the development of the microstructure was followed by time-lapse photography. In dry amples, carnallite deforms by mechanical twinning, intracrystal1ine slip and by cataclastic proce se . The addition of brine strongly enhances dynamic recrystallization by progre sive misorientation of ubgrain and by grain boundary migration. Bi chofite hows imilar behaviour, in agreement with re ults from samples deformed in a triaxial apparatus. Important micro tructural processes during dynamic recrystallization of wet bischofite are grain coalescence, grain di ection and grain migration. The oscillatory motion of grain boundarie and udden large changes in grain boundary migration rate were important features. 251

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Development of microstructure during deformation of carnallite and bischofite in transmitted light

1987

International Journal of Rock Mechanics and Mining Sciences &am

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“…One such problem concerns the influence of FARX on dislocation creep behavior. In principle, rapid FARX (GBM) can act as a dislocation annihilation mechanism reducing steady state flow strength during dislocation creep [Urai, 1983[Urai, , 1985. However, no data have been published on the effects of FARX on steady state flow in rock salt.…”

Section: Introductionmentioning

confidence: 99%

Effect of confining pressure on dilatation, recrystallization, and flow of rock salt at 150°C

Peach¹,

Spiers²,

Trimby³

2001

J. Geophys. Res.

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Abstract. Microstructural evidence for fluid-assisted dynamic recrystallization (FADRX) is widespread in naturally deformed rock salt. However, the principal experimental evidence for FADRX in salt has been obtained from stress relaxation experiments, and it is unclear whether the process occurs during steady state dislocation creep and what its effect might be. Here we report deformation experiments performed on natural rock salt at a constant strain rate of 3.5x10 -7s -•, 150øC, and confining pressures Pt. of 3-30 MPa. Samples deformed at Pt. = 3 MPa showed continuous work hardening and minor dilatation. Microstructurally, they exhibited intergranular cracking plus slip band and subgrain structures indicative of dislocation glide/creep. Electron backscatter diffraction analysis revealed a high frequency of boundaries with low-angle misorientations in the range 5 ø-10 ø. In contrast, samples deformed at Pt. > 6.5 MPa showed work hardening followed by steady state flow at strains > 6-7%. These samples compacted slightly, and crystal plastic deformation was accompanied by extensive FADRX, with a predominance of highangle boundaries (300-50 ø) over low-angle boundaries. We infer that FADRX is suppressed by dilatation at low pressures as a result of grain boundary disruption. At pressures high enough to prevent dilatation, however, FADRX acts as a "recovery" mechanism counteracting work hardening. The results offer a possible explanation for rheological variability seen in previous experiments conducted at pressures up to 30 MPa. A simple rate model for diffusion-and interface-controlled FADRX indicates that FADRX should become increasingly important toward natural halokinetic conditions, although the effect on flow stresses is likely to be small.

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“…The results provide a useful check on the interpretation of microstructures found in samples of these materials, which had been deformed in a triaxial apparatus (Urai, 1983(Urai, , 1985. In addition, a study of the microstructural processes during ongoing dynamic recrystallization was made, and some details of the "catastrophic" changes in grain-boundary migration (Poirier and Guillope, 1979) could be studied.…”

Section: Introductionmentioning

confidence: 99%

Water-enhanced dynamic recrystallization and solution transfer in experimentally deformed carnallite

Cited by 49 publications

References 19 publications

Development of microstructure during deformation of carnallite and bischofite in transmitted light

Development of microstructure during deformation of carnallite and bischofite in transmitted light

Effect of confining pressure on dilatation, recrystallization, and flow of rock salt at 150°C

Development of microstructure during deformation of carnallite and bischofite in transmitted light

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