Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Acta Materialia"
Viser treff 1-17 av 17
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Athermal glass work at the nanoscale: Engineered electron-beam-induced viscoplasticity for mechanical shaping of brittle amorphous silica
(Journal article; Peer reviewed, 2022)Amorphous silica deforms viscoplastically at elevated temperatures, which is common for brittle glasses. The key mechanism of viscoplastic deformation involves interatomic bond switching, which is thermally activated. Here, ... -
Cleavage cracking of ductile-metal substrates induced by brittle coating fracture
(Journal article; Peer reviewed, 2018)Brittle coatings are often used to protect underlying ductile substrates from damage. Recent experimental observations show that the fracture of a brittle coating can cause the micro-cracking of the ductile metal substrates, ... -
Effect of electrochemical charging on the hydrogen embrittlement susceptibility of Alloy 718
(Peer reviewed; Journal article, 2019)The susceptibility of age-hardened nickel-based Alloy 718 to hydrogen embrittlement was studied by the controlled electrochemical charging combined with slow strain-rate tensile tests (SSRT) and advanced characterization ... -
Effect of hydrogen on nanomechanical properties in Fe-22Mn-0.6C TWIP steel revealed by in-situ electrochemical nanoindentation
(Journal article; Peer reviewed, 2018)In-situ electrochemical nanoindentation was applied to study the effect of hydrogen on the mechanical properties of Fe-22Mn-0.6C TWIP steel at nanoscale. Distinctive behaviors in three defined grain orientations: (001), ... -
Effect of Hydrogen on the Collective Behavior of Dislocations in the Case of Nanoindentation
(Journal article, 2018)Most of the studies reported treats the effect of hydrogen on single dislocation line, while models that describe the collective interaction are missing. In this study, hydrogen-induced softening of metallic materials is ... -
Electron-irradiation-induced reinforcement of reduced graphene oxide papers
(Journal article; Peer reviewed, 2013)Here we show that the graphene sheets in reduced graphene oxide papers (rGOPs) can be cross-linked by electron-irradiation-induced sp3 carbon atoms, resulting in significant enhancements in both the mechanical and electrical ... -
High temperature brittle film adhesion measured from annealing-induced circular blisters
(Journal article; Peer reviewed, 2017)Testing high temperature brittle film adhesion is necessary for understanding interfacial failure at elevated temperatures. However, current brittle film adhesion measurement methods are limited to room temperature. ... -
Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens
(Journal article, 2018)The susceptibility of the FeAl intermetallic alloy to hydrogen-assisted cracking was investigated by in situ fracture experiments using notched micrometre-sized specimens using an Environmental Scanning Electron Microscope ... -
Hydrogen-enhanced fatigue crack growth in a single-edge notched tensile specimen under in-situ hydrogen charging inside an environmental scanning electron microscope
(Journal article; Peer reviewed, 2019)Fatigue crack growth (FCG) test was done on a pre-cracked single-edge notched tensile (SENT) specimen with oligocrystalline ferritic structure. Innovative in-situ hydrogen (H)- charging by plasma inside an environmental ... -
Hydrogen-enhanced grain boundary vacancy stockpiling causes transgranular to intergranular fracture transition
(Journal article; Peer reviewed, 2022)The attention to hydrogen embrittlement (HE) has been intensified recently in the light of hydrogen as a carbon-free energy carrier. Despite worldwide research, the multifaceted HE mechanism remains a matter of debate. ... -
In situ characterization of the functional degradation of a [001¯] orientated Fe–Mn–Al–Ni single crystal under compression using acoustic emission measurements
(Peer reviewed; Journal article, 2021)Acoustic emission (AE) measurements were conducted in situ during cyclic compressive loading on an orientated single crystal of Fe-Mn-Al-Ni shape memory alloy to study functional degradation of its superelastic response. ... -
In situ micromechanical testing in environmental scanning electron microscope: A new insight into hydrogen-assisted cracking
(Journal article; Peer reviewed, 2018)The susceptibility of Fe–26Al–0.5Cr (at.%) intermetallic alloy to hydrogen assisted cracking was evaluated by micromechanical fracture mechanics specimens. The notched micro-beams were loaded in situ in an environmental ... -
Inhibiting stress corrosion cracking by removing corrosion products from the Mg-Zn-Zr alloy pre-exposed to corrosion solutions
(Peer reviewed; Journal article, 2021)Magnesium and its alloys are susceptible to stress-corrosion cracking (SCC), which can manifest itself during the slow-strain rate tensile (SSRT) testing in air if the specimens were pre-exposed to corrosive media. This ... -
Kinetics of cyclically-induced mechanical twinning in γ-TiAl unveiled by a combination of acoustic emission, neutron diffraction and electron microscopy
(Peer reviewed; Journal article, 2021)The cyclic response and the microstructure evolution of the near γ-TiAl alloy are investigated by a blend of contemporary experimental techniques centred around in-situ acoustic emission (AE) measurements reflecting the ... -
Multiaxial stress–strain response and displacive transformations in NiTi alloy from first principles
(Journal article; Peer reviewed, 2016)Present ab initio study was focussed on a response of NiTi martensite to a superposition of shear and tensile or compressive stresses acting normally to the shear planes. The theoretically predicted base-centered orthorhombic ... -
Neutron diffraction study of temperature-dependent elasticity of B19′ NiTi---Elinvar effect and elastic softening
(Peer reviewed; Journal article, 2019)The temperature-dependent elasticity of the B19′ NiTi is unknown today. To gain insights into the lattice-level temperature-dependent elasticity of the B19′ crystal, we present results of in-situ neutron diffraction ... -
Small scale testing approach to reveal specific features of slip behavior in BCC metals
(Peer reviewed; Journal article, 2019)Plastic behavior of Fe–3%Si was investigated with a novel methodology at microscopic scale and higher stress resolution beyond the existing macroscopic test methods. Activation of single slip system in micropillars under ...