Details
| Original language | English |
|---|---|
| Pages (from-to) | 385-393 |
| Number of pages | 9 |
| Journal | Materials Science Forum |
| Volume | 1016 |
| Publication status | Published - Jan 2021 |
Abstract
Magnesium alloys are important engineering materials due to their good combination of strength and very low densities. However, the low ductility imposed by the hcp-lattice has thus far limited the application of magnesium alloys as sheet material. The use of the electroplastic effect offers a route to increase formability of magnesium alloys while being more energy efficient than conventional hot forming. The underlying mechanism(s) of this effect have not yet been fully understood. This study investigates the impact of high current density electrical pulses on magnesium alloys. Special consideration was given to the effect of the orientation of the applied electric current relative to the mechanical loading of the specimens. The results show that the mechanical properties of coarse-grained materials are more strongly affected by the current pulses than finer grained material. Applying the current parallel to the compressive load shows a more pronounced softening of the material than pulses applied perpendicular to the mechanical stress. Microstructure investigations revealed the formation of twinning solely in the interior of grains even at stresses below the yield point for both configurations.
Keywords
- AZ31, Electric current, Electroplastic effect, Short pulses, Twin formation, WE43
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
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In: Materials Science Forum, Vol. 1016, 01.2021, p. 385-393.
Research output: Contribution to journal › Article › Research
}
TY - JOUR
T1 - Changes in Mechanical and Microstructural Properties of Magnesium Alloys Resulting from Superimposed High Current Density Pulses
AU - Demler, Eugen
AU - Diedrich, Alexander
AU - Dalinger, Andrej
AU - Gerstein, Gregory
AU - Herbst, Sebastian
AU - Zaefferer, Stefan
AU - Maier, Hans-Jürgen
N1 - Funding Information: Financial support by Deutsche Forschungsgemeinschaft (German Research Foundation) under project number 319282412 is gratefully acknowledged.
PY - 2021/1
Y1 - 2021/1
N2 - Magnesium alloys are important engineering materials due to their good combination of strength and very low densities. However, the low ductility imposed by the hcp-lattice has thus far limited the application of magnesium alloys as sheet material. The use of the electroplastic effect offers a route to increase formability of magnesium alloys while being more energy efficient than conventional hot forming. The underlying mechanism(s) of this effect have not yet been fully understood. This study investigates the impact of high current density electrical pulses on magnesium alloys. Special consideration was given to the effect of the orientation of the applied electric current relative to the mechanical loading of the specimens. The results show that the mechanical properties of coarse-grained materials are more strongly affected by the current pulses than finer grained material. Applying the current parallel to the compressive load shows a more pronounced softening of the material than pulses applied perpendicular to the mechanical stress. Microstructure investigations revealed the formation of twinning solely in the interior of grains even at stresses below the yield point for both configurations.
AB - Magnesium alloys are important engineering materials due to their good combination of strength and very low densities. However, the low ductility imposed by the hcp-lattice has thus far limited the application of magnesium alloys as sheet material. The use of the electroplastic effect offers a route to increase formability of magnesium alloys while being more energy efficient than conventional hot forming. The underlying mechanism(s) of this effect have not yet been fully understood. This study investigates the impact of high current density electrical pulses on magnesium alloys. Special consideration was given to the effect of the orientation of the applied electric current relative to the mechanical loading of the specimens. The results show that the mechanical properties of coarse-grained materials are more strongly affected by the current pulses than finer grained material. Applying the current parallel to the compressive load shows a more pronounced softening of the material than pulses applied perpendicular to the mechanical stress. Microstructure investigations revealed the formation of twinning solely in the interior of grains even at stresses below the yield point for both configurations.
KW - AZ31
KW - Electric current
KW - Electroplastic effect
KW - Short pulses
KW - Twin formation
KW - WE43
UR - http://www.scopus.com/inward/record.url?scp=85100908086&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.1016.385
DO - 10.4028/www.scientific.net/MSF.1016.385
M3 - Article
VL - 1016
SP - 385
EP - 393
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
ER -