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AuthorDong, Yuedc.contributor.author
Date of accession2021-03-04T12:48:14Zdc.date.accessioned
Available in OPARU since2021-03-04T12:48:14Zdc.date.available
Year of creation2020dc.date.created
Date of first publication2021-03-04dc.date.issued
AbstractDifferent from the traditional crystalline metals, metallic glasses are amorphous materials with short atomic range order. Due to this special structure, most metallic glasses have high strength, high hardness, large elastic deformation and good corrosion resistance. However, because the plastic deformation can only proceed by the formation and sliding of shear bands, metallic glasses tend to be rather brittle materials. The aim of this research is to improve the mechanical properties of bulk metallic glasses. In this research, nano-structured metallic glasses were synthesized by phase separation method with composition Zr55.7Ni10Al7Cu19Co8.3 (at.%). The validity of the nanoglass concept based on glass/glass interfaces was verified. In this structure, stronger Zr-Co atomic bonds replaced Zr-Zr bonds, leading to the increased strength and hardness. The glassy denser particles can hinder the movement of shear bands, resulting in large maximum elastic strain (~ 2.7%). In compression test, multiple shear bands and improved plasticity can be observed on the nano-structured metallic glasses. To further enhance their tensile performance, various post-processing methods have been investigated, including annealing, thermal cycling and high pressure torsion. Two-rotations high pressure torsion treatment introduced a large number of shear bands and nano-scaled crystal particles in the nano-structured metallic glasses. With this structure, the cracks propagation during tension was inhibited effectively, resulting in good tensile plasticity (tensile plastic strain ~ 0.9%). With these outstanding properties, the nano-structured metallic glasses have large application potential as new engineering materials.dc.description.abstract
Languageen_USdc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
KeywordMetallic glassdc.subject
KeywordNanoglassdc.subject
KeywordSynchrotron radiation analysisdc.subject
KeywordMechanical propertiesdc.subject
KeywordIn-situ tensile/compression testdc.subject
KeywordHigh pressure torsiondc.subject
Dewey Decimal GroupDDC 540 / Chemistry & allied sciencesdc.subject.ddc
LCSHMetallic glassesdc.subject.lcsh
LCSHMicrostructuredc.subject.lcsh
LCSHSynchrotron radiation sourcesdc.subject.lcsh
LCSHMaterials Mechanical propertiesdc.subject.lcsh
LCSHThermal propertiesdc.subject.lcsh
TitleStructure, mechanical properties and post-processing of nano-structured metallic glassesdc.title
Resource typeDissertationdc.type
Date of acceptance2020-12-04dcterms.dateAccepted
RefereeFecht, Hans-Jörgdc.contributor.referee
RefereeDommann, Alexdc.contributor.referee
RefereeJiang, Jian-Zhongdc.contributor.referee
DOIhttp://dx.doi.org/10.18725/OPARU-35698dc.identifier.doi
PPN175052046Xdc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-oparu-35760-5dc.identifier.urn
GNDMikrostrukturdc.subject.gnd
GNDThermophysikalische Eigenschaftdc.subject.gnd
FacultyFakultät für Ingenieurwissenschaften, Informatik und Psychologieuulm.affiliationGeneral
InstitutionInstitut für Funktionelle Nanosystemeuulm.affiliationSpecific
Grantor of degreeFakultät für Ingenieurwissenschaften, Informatik und Psychologieuulm.thesisGrantor
DCMI TypeTextuulm.typeDCMI
CategoryPublikationenuulm.category
University Bibliographyjauulm.unibibliographie


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