2026-09-19T11:54:17Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1041502022-01-13T07:55:22Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Michael Demkowicz.
Chesser, Ian (Ian W.)
Massachusetts Institute of Technology. Department of Materials Science and Engineering.
Massachusetts Institute of Technology. Department of Materials Science and Engineering
2016-09-13T18:10:19Z
2016-09-13T18:10:19Z
2016
2016
http://hdl.handle.net/1721.1/104150
958279204
Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 44-46).
Accumulative roll bonding (ARB) of three copper-niobium (Cu-Nb) nano-composite models is simulated using molecular statics techniques to assess the rotational stability of Cu-Nb interfaces at high strains up to 90% thickness reduction. Crystals strain and rotate under compression, and certain Cu-Nb composites have been shown to reach a steady state of rotation at large rolling reductions. These steady-state rotations correspond to the formation of a preferred interface character between layers. Cumulative rotation of Cu and Nb layers was tracked as a function of strain using a rotation algorithm. A Cu-Nb bicrystal and poly-crystalline model with a {111}<110> Cu// {110}<111> Nb interface character were found to rotate significantly from their initial crystallographic orientation under compression. A Cu-Nb bi-crystal model with a {112}<111>Cu // {112}<110>Nb interface character was found to rotate less when rolled in the transverse direction compared to the typical <111>Cu//<110>Nb rolling direction. Results show that experimentally observed plastic stability of rolled Cu-Nb composites comes from a factor not accounted for in the simulation, like thermally activated dislocation mechanisms. The study refines the current knowledge of plastic stability in Cu-Nb composites.
by Ian Chesser.
S.B.
46 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Materials Science and Engineering.
Atomistic simulation of deformation induced rotation in Cu-Nb composites
Thesis
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<Abstract>Accumulative roll bonding (ARB) of three copper-niobium (Cu-Nb) nano-composite models is simulated using molecular statics techniques to assess the rotational stability of Cu-Nb interfaces at high strains up to 90% thickness reduction. Crystals strain and rotate under compression, and certain Cu-Nb composites have been shown to reach a steady state of rotation at large rolling reductions. These steady-state rotations correspond to the formation of a preferred interface character between layers. Cumulative rotation of Cu and Nb layers was tracked as a function of strain using a rotation algorithm. A Cu-Nb bicrystal and poly-crystalline model with a {111}<110> Cu// {110}<111> Nb interface character were found to rotate significantly from their initial crystallographic orientation under compression. A Cu-Nb bi-crystal model with a {112}<111>Cu // {112}<110>Nb interface character was found to rotate less when rolled in the transverse direction compared to the typical <111>Cu//<110>Nb rolling direction. Results show that experimentally observed plastic stability of rolled Cu-Nb composites comes from a factor not accounted for in the simulation, like thermally activated dislocation mechanisms. The study refines the current knowledge of plastic stability in Cu-Nb composites.</Abstract>
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