Compressive creep of ice containing a liquid intergranular phase: Rate-controlling processes in the dislocation creep regime
نویسندگان
چکیده
منابع مشابه
Creep Deformation of Ice
Knowledge of the creep properties of ice often is needed in field and theoretical studies of the flow and deformation of glaciers, ice shelves, and ice sheets. Recently many of the icy moons in the solar system have become much better known as a result of the successful deep-space probe missions. An understanding of the physical processes that take place within them requires information about t...
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We simulate the glide motion of an assembly of interacting dislocations under the action of an external shear stress and show that the associated plastic creep relaxation follows Andrade's law. Our results indicate that Andrade creep in plastically deforming crystals involves the correlated motion of dislocation structures near a dynamic transition separating a flowing from a jammed phase. Simu...
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The compressive creep deforrn;~tiort microstructure of polycrystalline Ni3AI h:is been observed by transnlission electron microscopy (TEM). ( 1 1 I ) rind ( 110) slip systems have been identified in primary creep. Dissociatiort of edge superparti:~l pairs perpendicular to the slip plane (both { 11 1 ) and ( 110) ) is common in crept specimens. I'he formation of this superdislocation...
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New microstructural rate controlling models for high temperature deformation are suggested which are in satisfactory agreement not only with activation parameter values but also with various metallographic observations. Non-compact slip in the HCP and FCC structures can be described by a kink pair mechanism. This process could control dislocation glide through subgrains, and therefore the creep...
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In thermoelectric devices, Bi2Te3 must be able to operate under high temperature gradients for very long times (years) without appreciable deformation, while being subjected to stresses created by internal thermal mismatch and external forces (e.g., vibrations). The deformation rate of cast, coarsegrained Bi2Te3 was measured under uniaxial compressive stresses from 2 to 16 MPa at temperatures b...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 1999
ISSN: 0094-8276
DOI: 10.1029/1998gl900289