Title:
Nanomechanics of plasticity in ultra-strength metals and shape memory alloys

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dc.contributor.advisor Zhu, Ting
dc.contributor.author Zhong, Yuan en_US
dc.contributor.committeeMember McDowell, David L.
dc.contributor.committeeMember Kenneth Gall
dc.contributor.committeeMember Olivier Pierron
dc.contributor.committeeMember Arash Yavari
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2013-01-17T21:10:22Z
dc.date.available 2013-01-17T21:10:22Z
dc.date.issued 2012-08-23 en_US
dc.description.abstract We study the plasticity mechanisms of diffusionless martensite phase transformation in Nickel-Titanium, one of the most widely used shape memory alloys. The research here involves four thrusts focusing on different length and time scales: (I) Molecular statics and dynamics simulations are applied to study the nanotwin structures and temperature-driven B2 → B19′ phase transitions. (II) Molecular dynamics simulations are performed to explore the stress-driven martensitic phase transformation governing the pseudoelasticity and shape memory effects in NiTi nanopillars. (III) Monte Carlo simulations are conducted to characterize the temperature- driven B2 → B19 phase transition and the patterning of martensitic nanotwins in NiTi thin films. (IV) Phase field simulations are performed to predict the formation and evolution of complex martensitic microstructures, including the detailed analysis of twin compatibility under complex loading conditions. We also study the nucleation-controlled plasticity mechanisms in different metals of Cu, Al and Ni. Our work focuses on understanding how dislocations nucleate in single crystals. Interatomic potential finite element method is applied to determine when, where and how dislocations nucleate during nanoindentation in metals such as Cu, Al and Ni. en_US
dc.description.degree PhD en_US
dc.identifier.uri http://hdl.handle.net/1853/45795
dc.publisher Georgia Institute of Technology en_US
dc.subject Martensitic phase transformation en_US
dc.subject Nucleation controlled plasticity en_US
dc.subject Shape memory en_US
dc.subject Nanomechanics en_US
dc.subject.lcsh Shape memory alloys
dc.subject.lcsh Alloys
dc.subject.lcsh Smart materials
dc.subject.lcsh Martensitic transformations
dc.title Nanomechanics of plasticity in ultra-strength metals and shape memory alloys en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Zhu, Ting
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication d68cedf1-dada-452f-aefb-0bf129c1368e
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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