Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 108153 |
| Fachzeitschrift | Materials and Design |
| Jahrgang | 183 |
| Frühes Online-Datum | 24 Aug. 2019 |
| Publikationsstatus | Veröffentlicht - 5 Dez. 2019 |
Abstract
A promising approach to deform metallic-intermetallic composite materials is the application of electric current pulses during the deformation process to achieve a lower yield strength and enhanced elongation to fracture. This is known as the electroplastic effect. In this work, a novel setup to study the electroplastic effect during nanoindentation on individual phases and well-defined interfaces was developed. Using a eutectic Al-Al2Cu alloy as a model material, electroplastic nanoindentation results were directly compared with macroscopic electroplastic compression tests. The results of the micro- and macroscopic investigations reveal current induced displacement shifts and stress drops, respectively, with the first displacement shift/stress drop being higher than the subsequent ones. A higher current intensity, higher loading rate and larger pulsing interval all cause increased displacement shifts. This observation, in conjunction with the fact that the first displacement shift is highest, strongly indicates that de-pinning of dislocations from obstacles dominates the mechanical response, rather than solely thermal effects.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
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in: Materials and Design, Jahrgang 183, 108153, 05.12.2019.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Investigation of the electroplastic effect using nanoindentation
AU - Andre, D.
AU - Burlet, T.
AU - Körkemeyer, Franz
AU - Gerstein, Gregory
AU - Gibson, J. S.K.L.
AU - Sandlöbes-Haut, S.
AU - Korte-Kerzel, S.
N1 - Funding Information: The authors gratefully acknowledge the funding of the priority program ?Manipulation of matter controlled by electric and magnetic field: Towards novel synthesis and processing routes of inorganic materials? (SPP 1959/1) by the German Research Foundation (DFG). This work was supported by grant number 319419837 and grant number 319282412. The raw data required to reproduce these findings are available on request from the corresponding author of this study.
PY - 2019/12/5
Y1 - 2019/12/5
N2 - A promising approach to deform metallic-intermetallic composite materials is the application of electric current pulses during the deformation process to achieve a lower yield strength and enhanced elongation to fracture. This is known as the electroplastic effect. In this work, a novel setup to study the electroplastic effect during nanoindentation on individual phases and well-defined interfaces was developed. Using a eutectic Al-Al2Cu alloy as a model material, electroplastic nanoindentation results were directly compared with macroscopic electroplastic compression tests. The results of the micro- and macroscopic investigations reveal current induced displacement shifts and stress drops, respectively, with the first displacement shift/stress drop being higher than the subsequent ones. A higher current intensity, higher loading rate and larger pulsing interval all cause increased displacement shifts. This observation, in conjunction with the fact that the first displacement shift is highest, strongly indicates that de-pinning of dislocations from obstacles dominates the mechanical response, rather than solely thermal effects.
AB - A promising approach to deform metallic-intermetallic composite materials is the application of electric current pulses during the deformation process to achieve a lower yield strength and enhanced elongation to fracture. This is known as the electroplastic effect. In this work, a novel setup to study the electroplastic effect during nanoindentation on individual phases and well-defined interfaces was developed. Using a eutectic Al-Al2Cu alloy as a model material, electroplastic nanoindentation results were directly compared with macroscopic electroplastic compression tests. The results of the micro- and macroscopic investigations reveal current induced displacement shifts and stress drops, respectively, with the first displacement shift/stress drop being higher than the subsequent ones. A higher current intensity, higher loading rate and larger pulsing interval all cause increased displacement shifts. This observation, in conjunction with the fact that the first displacement shift is highest, strongly indicates that de-pinning of dislocations from obstacles dominates the mechanical response, rather than solely thermal effects.
KW - Al-Cu alloys
KW - Electroplasticity
KW - Metallic-intermetallic composites
KW - Nanoindentation
UR - http://www.scopus.com/inward/record.url?scp=85071877618&partnerID=8YFLogxK
U2 - 10.48550/arXiv.1905.13518
DO - 10.48550/arXiv.1905.13518
M3 - Article
AN - SCOPUS:85071877618
VL - 183
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
M1 - 108153
ER -