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Titel: How the interface type manipulates the thermomechanical response of nanostructured metals : A case study on nickel
VerfasserIn: Renk, O.
Maier-Kiener, V.
Motz, C.
Eckert, J.
Kiener, D.
Pippan, R.
Sprache: Englisch
Titel: Materialia
Bandnummer: 15
Verlag/Plattform: Elsevier
Erscheinungsjahr: 2021
Freie Schlagwörter: Interface structure
Boundary character
Nanotwinned
Intergranular stress relaxation
Nanoindentation
Nickel
Rate controlling process
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: The presence of interfaces with nanoscale spacing significantly enhances the strength of materials, but also the rate controlling processes of plastic flow are subject to change. Due to the confined grain volumes, intragranular dislocation-dislocation interactions, the predominant processes at the micrometer scale, are replaced by emission of dislocations from and their subsequent accommodation at the interfaces. Both processes not only depend on the interfacial spacing, but also on the atomistic structure of the interface. Hence, a thorough understanding how these processes are affected by the interface structure is required to predict and improve the behavior of nanomaterials. The present study attempts to rationalize this effect by investigating the thermomechanical behavior of samples consisting of three different interfaces. Pure nickel samples with predominant fractions of low- and high-angle as well as twin boundaries with a similar average spacing around 150 nm are investigated using high temperature nanoindentation strain rate jump tests. Depending on the interface structure, hardness, strain rate sensitivity and apparent activation volumes evolve distinctively different with testing temperature. While in case of high-angle boundaries for all quantities a pronounced thermal dependence is found, the other two interface types behave almost athermal in the same temperature range. These differences can be rationalized based on the different interfacial diffusivity, affecting the predominant process of interfacial stress relaxation.
DOI der Erstveröffentlichung: 10.1016/j.mtla.2021.101020
URL der Erstveröffentlichung: http://dx.doi.org/10.1016/j.mtla.2021.101020
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-383127
hdl:20.500.11880/34569
http://dx.doi.org/10.22028/D291-38312
ISSN: 2589-1529
Datum des Eintrags: 30-Nov-2022
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Prof. Dr. Christian Motz
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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