Strain-induced phase transformation under compression in a diamond anvil cell: Simulations of a sample and gasket Feng, Biao Levitas, Valery Levitas, Valery Ma, Yanzhang
dc.contributor.department Aerospace Engineering 2018-02-14T01:35:44.000 2020-06-29T22:45:55Z 2020-06-29T22:45:55Z Wed Jan 01 00:00:00 UTC 2014 2015-03-18 2014-01-01
dc.description.abstract <p>Combined high pressure phase transformations (PTs) and plastic flow in a sample within a gasket compressed in diamond anvil cell (DAC) are studied for the first time using finite element method. The key point is that phase transformations are modelled as strain-induced, which involves a completely different kinetic description than for traditional pressure-induced PTs. The model takes into account, contact sliding with Coulomb and plastic friction at the boundaries between the sample, gasket, and anvil. A comprehensive computational study of the effects of the kinetic parameter, ratio of the yield strengths of high and low-pressure phases and the gasket, sample radius, and initial thickness on the PTs and plastic flow is performed. A new sliding mechanism at the contact line between the sample, gasket, and anvil called extrusion-based pseudoslip is revealed, which plays an important part in producing high pressure. Strain-controlled kinetics explains why experimentally determined phase transformation pressure and kinetics (concentration of high pressure phase vs. pressure) differ for different geometries and properties of the gasket and the sample: they provide different plastic strain, which was not measured. Utilization of the gasket changes radial plastic flow toward the center of a sample, which leads to high quasi-homogeneous pressure for some geometries. For transformation to a stronger high pressure phase, plastic strain and concentration of a high-pressure phase are also quasi-homogeneous. This allowed us to suggest a method of determining strain-controlled kinetics from experimentation, which is not possible for weaker and equal-strength high-pressure phases and cases without a gasket. Some experimental phenomena are reproduced and interpreted. Developed methods and obtained results represent essential progress toward the understanding of PTs under compression in the DAC. This will allow one optimal design of experiments and conditions for synthesis of new high pressure phases.</p>
dc.description.comments <p><p>This article is from <em>Journal of Applied Physics</em>115 (2014): 163509, doi:<a href="" target="_blank">10.1063/1.4873460</a>. Posted with permission.</p></p>
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dc.identifier archive/
dc.identifier.articleid 1039
dc.identifier.contextkey 5661266
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dc.identifier.submissionpath aere_pubs/39
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 23:54:29 UTC 2022
dc.source.uri 10.1063/1.4873460
dc.subject.disciplines Aerospace Engineering
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanical Engineering
dc.title Strain-induced phase transformation under compression in a diamond anvil cell: Simulations of a sample and gasket
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 850871e3-115a-428e-82cc-cbfafef5cf66
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