Details
| Original language | English |
|---|---|
| Article number | 2201912 |
| Journal | Advanced engineering materials |
| Volume | 25 |
| Issue number | 18 |
| Early online date | 25 May 2023 |
| Publication status | Published - Sept 2023 |
Abstract
Herein, the mechanisms of the electroplastic effect (EPE) in different hexagonal close-packed (hcp) metals under varying loading conditions and current densities through the analysis of flow curves and microstructural changes are investigated. The investigations show a significant change in the forming behavior of the hcp materials as a result of superimposed electric current impulses. This behavior could be attributed to two effects. On the one hand, additional dislocation types are activated; on the other hand, new characteristic twin bands are formed. This is shown for all three hcp materials under investigation: Ti, Mg, and Zn. Furthermore, the hypothesis of the existence of a critical value of the current density at which a significant change in the plastic behavior occurs is verified by the experiments. The magnitude of this critical value for the analyzed hcp materials corresponds approximately to the theoretical values reported to be in the range of 1.6 to 2.0 kA mm−2. In addition to the current density, the duration of the pulses also has an influence on the EPE. Understanding the correlation between the individual activated deformation mechanisms during electric pulse treatment can be crucial for controlling the electroplastic forming processes in a systematic and targeted manner.
Keywords
- electroplastic effect, high current impulses, stress drop, twinning
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Advanced engineering materials, Vol. 25, No. 18, 2201912, 09.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electroplasticity Mechanisms in hcp Materials
AU - Herbst, Sebastian
AU - Karsten, Elvira
AU - Gerstein, Gregory
AU - Reschka, Silvia
AU - Nürnberger, Florian
AU - Zaefferer, Stefan
AU - Maier, Hans Jürgen
N1 - Funding Information: This work was supported by the German Research Foundation (DFG) within the Priority Program “Fields matter” (SPP 1959) under the grant number 319282412.
PY - 2023/9
Y1 - 2023/9
N2 - Herein, the mechanisms of the electroplastic effect (EPE) in different hexagonal close-packed (hcp) metals under varying loading conditions and current densities through the analysis of flow curves and microstructural changes are investigated. The investigations show a significant change in the forming behavior of the hcp materials as a result of superimposed electric current impulses. This behavior could be attributed to two effects. On the one hand, additional dislocation types are activated; on the other hand, new characteristic twin bands are formed. This is shown for all three hcp materials under investigation: Ti, Mg, and Zn. Furthermore, the hypothesis of the existence of a critical value of the current density at which a significant change in the plastic behavior occurs is verified by the experiments. The magnitude of this critical value for the analyzed hcp materials corresponds approximately to the theoretical values reported to be in the range of 1.6 to 2.0 kA mm−2. In addition to the current density, the duration of the pulses also has an influence on the EPE. Understanding the correlation between the individual activated deformation mechanisms during electric pulse treatment can be crucial for controlling the electroplastic forming processes in a systematic and targeted manner.
AB - Herein, the mechanisms of the electroplastic effect (EPE) in different hexagonal close-packed (hcp) metals under varying loading conditions and current densities through the analysis of flow curves and microstructural changes are investigated. The investigations show a significant change in the forming behavior of the hcp materials as a result of superimposed electric current impulses. This behavior could be attributed to two effects. On the one hand, additional dislocation types are activated; on the other hand, new characteristic twin bands are formed. This is shown for all three hcp materials under investigation: Ti, Mg, and Zn. Furthermore, the hypothesis of the existence of a critical value of the current density at which a significant change in the plastic behavior occurs is verified by the experiments. The magnitude of this critical value for the analyzed hcp materials corresponds approximately to the theoretical values reported to be in the range of 1.6 to 2.0 kA mm−2. In addition to the current density, the duration of the pulses also has an influence on the EPE. Understanding the correlation between the individual activated deformation mechanisms during electric pulse treatment can be crucial for controlling the electroplastic forming processes in a systematic and targeted manner.
KW - electroplastic effect
KW - high current impulses
KW - stress drop
KW - twinning
UR - http://www.scopus.com/inward/record.url?scp=85162921371&partnerID=8YFLogxK
U2 - 10.1002/adem.202201912
DO - 10.1002/adem.202201912
M3 - Article
AN - SCOPUS:85162921371
VL - 25
JO - Advanced engineering materials
JF - Advanced engineering materials
SN - 1438-1656
IS - 18
M1 - 2201912
ER -