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Elastically accommodated grain-boundary sliding: New insights from experiment and modeling

Jackson, Ian; Faul, Ulrich; Skelton, Richard

Description

Substantial progress is reported towards a reconciliation of experimental observations of high-temperature viscoelastic behaviour of fine-grained materials with the micromechanical theory of grain-boundary sliding. The classic Raj-Ashby theory of grain boundary sliding has recently been revisited - confirming the presence of the following features: (i) at a characteristic period τe much less than the Maxwell relaxation time τd, a dissipation peak of amplitude ~10-2 and associated shear modulus...[Show more]

dc.contributor.authorJackson, Ian
dc.contributor.authorFaul, Ulrich
dc.contributor.authorSkelton, Richard
dc.date.accessioned2015-12-10T23:34:52Z
dc.identifier.issn0031-9201
dc.identifier.urihttp://hdl.handle.net/1885/69607
dc.description.abstractSubstantial progress is reported towards a reconciliation of experimental observations of high-temperature viscoelastic behaviour of fine-grained materials with the micromechanical theory of grain-boundary sliding. The classic Raj-Ashby theory of grain boundary sliding has recently been revisited - confirming the presence of the following features: (i) at a characteristic period τe much less than the Maxwell relaxation time τd, a dissipation peak of amplitude ~10-2 and associated shear modulus relaxation resulting from elastically accommodated sliding on grain boundaries of relatively low viscosity; (ii) at intermediate periods, a broad regime of diffusionally-assisted grain-boundary sliding within which the dissipation varies with period as Q-1~Toα with α~1/3, sliding being limited by stress concentrations at grain corners, that are progressively eroded with increasing period and diffusion distance; and (iii) for periods longer than the Maxwell relaxation time τd, diffusionally accommodated grain-boundary sliding with Q-1~To. For periods To≫τe, laboratory dissipation data may be adequately described as a function of a single master variable, namely the normalised period To/τd. However, it is becoming increasingly clear that the lower levels of dissipation measured at shorter periods deviate from such a master curve - consistent with the existence of the two characteristic timescales, τe and τd, for grain-boundary sliding, with distinct grain-size sensitivities. New forced-oscillation data at moderate temperatures (short normalised periods) provide tentative evidence of the dissipation peak of elastically accommodated sliding. Complementary torsional microcreep data indicate that, at seismic periods of 1-1000s, much of the non-elastic strain is recoverable - consistent with substantial contributions from elastically accommodated and diffusionally assisted grain-boundary sliding.
dc.publisherElsevier
dc.sourcePhysics of the Earth and Planetary Interiors
dc.titleElastically accommodated grain-boundary sliding: New insights from experiment and modeling
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume228
dc.date.issued2014
local.identifier.absfor040200 - GEOCHEMISTRY
local.identifier.ariespublicationU3488905xPUB2071
local.type.statusPublished Version
local.contributor.affiliationJackson, Ian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFaul, Ulrich, Massachusetts Institute of Technology
local.contributor.affiliationSkelton, Richard, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage203
local.bibliographicCitation.lastpage210
local.identifier.doi10.1016/j.pepi.2013.11.014
dc.date.updated2015-12-10T11:36:45Z
local.identifier.scopusID2-s2.0-84897077622
local.identifier.thomsonID000337014100022
CollectionsANU Research Publications

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