Epler, Eike

[["dc.bibliographiccitation.firstpage","337"],["dc.bibliographiccitation.journal","Acta Materialia"],["dc.bibliographiccitation.lastpage","343"],["dc.bibliographiccitation.volume","140"],["dc.contributor.author","Mangipudi, K. R."],["dc.contributor.author","Epler, E."],["dc.contributor.author","Volkert, C. A."],["dc.date.accessioned","2020-12-10T14:14:52Z"],["dc.date.available","2020-12-10T14:14:52Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1016/j.actamat.2017.08.039"],["dc.identifier.issn","1359-6454"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71528"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Morphological similarity and structure-dependent scaling laws of nanoporous gold from different synthesis methods"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","115"],["dc.bibliographiccitation.journal","Acta Materialia"],["dc.bibliographiccitation.lastpage","122"],["dc.bibliographiccitation.volume","119"],["dc.contributor.author","Mangipudi, Kodanda Ram"],["dc.contributor.author","Epler, Eike"],["dc.contributor.author","Volkert, Cynthia A."],["dc.date.accessioned","2018-11-07T10:07:01Z"],["dc.date.available","2018-11-07T10:07:01Z"],["dc.date.issued","2016"],["dc.description.abstract","Nanoporous gold (np-Au) differs from its macroporous counterparts through its ligament and pore length scales, its high relative density, and its very distinct mesoscale cellular architecture. When reexamining the applicability of conventional macroporous foam scaling laws to np-Au, difficulties persist not only in determining the solid properties of nanoscale ligaments, but also because np-Au structure is not self-similar as the relative density changes. Thus, a clear distinction of the effects of relative density and structure is required. This paper aims to capture the role of topology and morphology into the scaling laws by comparing the overall mechanical response of real np-Au structures with the behavior of spinodal and gyroid structures. Quantitative morphological and topological characterization of these structures has been carried out and their role on the macroscopic elastoplastic response of np-Au has been studied using finite element (FE) simulations. The predicted elastic modulus of real np-Au structures from FE simulations is in remarkable agreement with the nanoindentation measurements, and validates the numerical simulations. Quantitative structural analysis reveals that np-Au and spinodal structures are topologically very distinct, but similar in their morphology. On the other hand, gyroids are both morphologically and topologically very distinct from np-Au. The results suggest that the macroscopic stiffness and strength are highly sensitive to the topology, while being relatively much less sensitive to the morphology. The effects of structural topology are captured into modified scaling laws where the geometric pre-factors for the stiffness and strength are found to vary linearly with the scaled genus. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","DFG [MA 5785/1-1, VO 928/8-1]"],["dc.identifier.doi","10.1016/j.actamat.2016.08.012"],["dc.identifier.isi","000384778300011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39201"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-2453"],["dc.relation.issn","1359-6454"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Topology-dependent scaling laws for the stiffness and strength of nanoporous gold"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","557"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Microscopy and Microanalysis"],["dc.bibliographiccitation.lastpage","563"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Pfeiffer, Bjoern"],["dc.contributor.author","Erichsen, Torben"],["dc.contributor.author","Epler, Eike"],["dc.contributor.author","Volkert, Cynthia A."],["dc.contributor.author","Trompenaars, Piet"],["dc.contributor.author","Nowak, Carsten"],["dc.date.accessioned","2018-11-07T09:56:15Z"],["dc.date.available","2018-11-07T09:56:15Z"],["dc.date.issued","2015"],["dc.description.abstract","A method to characterize open-cell nanoporous materials with atom probe tomography (APT) has been developed. For this, open-cell nanoporous gold with pore diameters of around 50 nm was used as a model system, and filled by electron beam-induced deposition (EBID) to obtain a compact material. Two different EBID precursors were successfully tested-dicobalt octacarbonyl [Co-2(CO)(8)] and diiron nonacarbonyl [Fe-2(CO)(9)]. Penetration and filling depth are sufficient for focused ion beam-based APT sample preparation. With this approach, stable APT analysis of the nanoporous material can be performed. Reconstruction reveals the composition of the deposited precursor and the nanoporous material, as well as chemical information of the interfaces between them. Thus, it is shown that, using an appropriate EBID process, local chemical information in three dimensions with sub-nanometer resolution can be obtained from nanoporous materials using APT."],["dc.identifier.doi","10.1017/S1431927615000501"],["dc.identifier.isi","000358836400003"],["dc.identifier.pmid","25990813"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36918"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1435-8115"],["dc.relation.issn","1431-9276"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Characterization of Nanoporous Materials with Atom Probe Tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1575"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Energy technology"],["dc.bibliographiccitation.lastpage","1581"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Epler, Eike"],["dc.contributor.author","Roddatis, Vladimir V."],["dc.contributor.author","Volkert, Cynthia A."],["dc.date.accessioned","2020-12-10T14:06:30Z"],["dc.date.available","2020-12-10T14:06:30Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1002/ente.201600175"],["dc.identifier.issn","2194-4288"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69920"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C05 Kontrolle Elektronen-getriebener Chemie durch Interkalation"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Measuring Mechanical Properties during the Electrochemical Lithiation of Silicon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","796"],["dc.bibliographiccitation.journal","Acta Materialia"],["dc.bibliographiccitation.lastpage","808"],["dc.bibliographiccitation.volume","103"],["dc.contributor.author","Ma, Duancheng"],["dc.contributor.author","Eisenlohr, Philip"],["dc.contributor.author","Epler, Eike"],["dc.contributor.author","Volkert, Cynthia A."],["dc.contributor.author","Shanthraj, Pratheek"],["dc.contributor.author","Diehl, Martin"],["dc.contributor.author","Roters, Franz"],["dc.contributor.author","Raabe, Dierk"],["dc.date.accessioned","2018-11-07T10:19:23Z"],["dc.date.available","2018-11-07T10:19:23Z"],["dc.date.issued","2016"],["dc.description.abstract","We present a study on the plastic deformation of single crystalline stochastic honeycombs under inplane compression using a crystal plasticity constitutive descriptionfor face-centered cubic (fcc) materials, focusing on the very early stage of plastic deformation, and identifying the interplay between the crystallographic orientation and the cellular structure during plastic deformation. We observe that despite the stochastic structure, surprisingly, the slip system activations in the honeycombs are almost identical to their corresponding bulk single crystals at the early stage of the plastic deformation. On the other hand, however, the yield stresses of the honeycombs are nearly independent of their crystallographic orientations. Similar mechanical response is found in compression testing of nanoporous gold micropillars aligned with various crystallographic orientations. The macroscopic stress tensors of the honeycombs show the same anisotropy as their respective bulk single crystals. Locally, however, there is an appreciable fluctuation in the local stresses, which are even larger than for polycrystals. This explains why the Taylor/Schmid factor associated with the crystallographic orientation is less useful to estimate the yield stresses of the honeycombs than the bulk single crystals and polycrystals, and why the plastic deformation occurs at smaller strains in the honeycombs than their corresponding bulk single crystals. Besides these findings, the observations of the crystallographic reorientation suggest that conventional orientation analysis tools, such as inverse pole figure and related tools, would in general fail to study the plastic deformation mechanism of monocrystalline cellular materials. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.actamat.2015.11.016"],["dc.identifier.isi","000367630500079"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41648"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-2453"],["dc.relation.issn","1359-6454"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","150"],["dc.bibliographiccitation.journal","Scripta Materialia"],["dc.bibliographiccitation.lastpage","153"],["dc.bibliographiccitation.volume","146"],["dc.contributor.author","Mangipudi, K.R."],["dc.contributor.author","Epler, E."],["dc.contributor.author","Volkert, C.A."],["dc.date.accessioned","2020-12-10T15:21:15Z"],["dc.date.available","2020-12-10T15:21:15Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.scriptamat.2017.11.033"],["dc.identifier.issn","1359-6462"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72965"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","On the multiaxial yielding and hardness to yield stress relation of nanoporous gold"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","762"],["dc.bibliographiccitation.issue","S2"],["dc.bibliographiccitation.journal","Microscopy and Microanalysis"],["dc.bibliographiccitation.lastpage","763"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Volkert, C.A."],["dc.contributor.author","Roos, B."],["dc.contributor.author","Kapelle, B."],["dc.contributor.author","Kelling, A."],["dc.contributor.author","Epler, E."],["dc.contributor.author","Richter, G."],["dc.date.accessioned","2014-06-03T10:52:00Z"],["dc.date.accessioned","2021-10-11T11:36:53Z"],["dc.date.available","2014-06-03T10:52:00Z"],["dc.date.available","2021-10-11T11:36:53Z"],["dc.date.issued","2012"],["dc.description.abstract","n.n."],["dc.identifier.doi","10.1017/S1431927612005661"],["dc.identifier.fs","595438"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10165"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/90814"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.issn","1435-8115"],["dc.relation.issn","1431-9276"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.subject","Nanostructure; metals; Deformation"],["dc.title","Revealing Deformation Mechanisms In Nanoscale Metals"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]