Title :

Room temperature electron beam sensitive viscoplastic response of ultra-ductile amorphous olivine films

Author(s) :

Orekhov, Andrey [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Gauquelin, Nicolas [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Kermouche, Guillaume [Auteur]
Université de Lyon
Gomez-Perez, Alejandro [Auteur]
Baral, Paul [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Université de Lyon
Dohmen, Ralf [Auteur]
Ruhr University Bochum = Ruhr-Universität Bochum [RUB]
Coulombier, Michaël [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Verbeeck, Johan [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Raskin, Jean Pierre [Auteur]
Institute of Information and Communication Technologies, Electronics and Applied Mathematics [ICTEAM]
Pardoen, Thomas [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Schryvers, Dominique [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Lin, Jun [Auteur]
Université de Montpellier [UM]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Idrissi, Hosni [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)

Journal title :

ACTA MATERIALIA

Abbreviated title :

Acta Materialia

Volume number :

282

Pages :

120479

Publisher :

Elsevier BV

Publication date :

2024-10-19

ISSN :

1359-6454

English keyword(s) :

Transmission electron microscopy
Amorphous olivine
Nanomechanical testing
Electron irradiation

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

The mechanical properties of amorphous olivine (a-olivine) deformed at room temperature are investigated in situ in a TEM under uniaxial tension using a Push-to-Pull (PTP) device. Thin films of a-olivine were produced by ...
Show more >The mechanical properties of amorphous olivine (a-olivine) deformed at room temperature are investigated in situ in a TEM under uniaxial tension using a Push-to-Pull (PTP) device. Thin films of a-olivine were produced by pulsed laser deposition (PLD). With or without electron irradiation, a-olivine films deform plastically, with a gradual transition that makes impossible the determination of a precise threshold. The strength attains values up to 2.5 GPa. The increasing strain-rate in load control results in an apparent softening with stress drop. The fracture strain reaches values close to 30 % without e-beam irradiation. Under electron illumination at 200 kV, the strength is lower, around 1.7 GPa, while higher elongations close to 36 % are obtained. Alternating beam-off and beam-on sequences lead to exceptionally large fracture strains equal to 68 % at 200 kV and 139 % at 80 kV. EELS measurements were performed to characterize the interaction between the electron beam and a-olivine. At a voltage of 80 kV, radiolysis accompanied by oxygen release dominates whereas at high voltage (300 kV) the interaction is dominated by knock-on type defects. Radiolysis is also the main interaction mechanism at 200 kV with low exposition which corresponds to most of our in situ TEM deformation experiments. To interpret the mechanical data, a simple 1D model has been developed to rationalize the load transfer between the PTP device and the specimen. The strain-rate sensitivity is 6 to 10 times higher when a-olivine is deformed under electron irradiation.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

Rheology of Earth materials: closing the gap between TIMEscales in the laboratory and in the MANtle

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Plasticité

Submission date :

2024-10-19T13:26:24Z
2024-10-23T07:13:36Z