A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy
The Mg-6.8Y-2.5Zn-0.4Zr (WZ73) alloy exhibits different microstructure characteristic after conventional casting compared to the twin-roll cast (TRC) state. Twin-roll casting results in a finer microstructure, where the LPSO phases are more finely distributed and less strongly connected. A transfer...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-06-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/13/3628 |
| _version_ | 1797528427946835968 |
|---|---|
| author | Kristina Kittner Madlen Ullmann Ulrich Prahl |
| author_facet | Kristina Kittner Madlen Ullmann Ulrich Prahl |
| author_sort | Kristina Kittner |
| collection | DOAJ |
| description | The Mg-6.8Y-2.5Zn-0.4Zr (WZ73) alloy exhibits different microstructure characteristic after conventional casting compared to the twin-roll cast (TRC) state. Twin-roll casting results in a finer microstructure, where the LPSO phases are more finely distributed and less strongly connected. A transfer of the hot deformation behavior from the as-cast condition to the TRC condition is only possible to a limited extent due to the microstructural differences. Both states show differences in the recrystallization behavior during hot deformation. In the conventional cast state, dynamic recrystallization (DRX) is assumed to be delayed by the occurrence of coarse blocky LPSO phases. Main DRX mechanisms are continuous dynamic recrystallization (CDRX), particle stimulated nucleation (PSN) and twin induced dynamic recrystallization (TDRX). The deformed TRC sample showed pronounced DRX at almost all deformation conditions. Besides the TDRX and the PSN mechanism, kink induced dynamic recrystallization (KDRX) can be observed. Optimum deformation conditions for both states are temperatures from 500 °C to 520 °C, and strain rates ranging from 0.01 s<sup>−1</sup> to 0.1 s<sup>−1</sup> for the as-cast material as well as a strain rate of 1 s<sup>−1</sup> for the TRC material. |
| first_indexed | 2024-03-10T09:58:11Z |
| format | Article |
| id | doaj.art-e277f076972147ebbe418be32dcf2597 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T09:58:11Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e277f076972147ebbe418be32dcf25972023-11-22T02:10:45ZengMDPI AGMaterials1996-19442021-06-011413362810.3390/ma14133628A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr AlloyKristina Kittner0Madlen Ullmann1Ulrich Prahl2Institute of Metal Forming, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599 Freiberg, GermanyInstitute of Metal Forming, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599 Freiberg, GermanyInstitute of Metal Forming, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Straße 4, 09599 Freiberg, GermanyThe Mg-6.8Y-2.5Zn-0.4Zr (WZ73) alloy exhibits different microstructure characteristic after conventional casting compared to the twin-roll cast (TRC) state. Twin-roll casting results in a finer microstructure, where the LPSO phases are more finely distributed and less strongly connected. A transfer of the hot deformation behavior from the as-cast condition to the TRC condition is only possible to a limited extent due to the microstructural differences. Both states show differences in the recrystallization behavior during hot deformation. In the conventional cast state, dynamic recrystallization (DRX) is assumed to be delayed by the occurrence of coarse blocky LPSO phases. Main DRX mechanisms are continuous dynamic recrystallization (CDRX), particle stimulated nucleation (PSN) and twin induced dynamic recrystallization (TDRX). The deformed TRC sample showed pronounced DRX at almost all deformation conditions. Besides the TDRX and the PSN mechanism, kink induced dynamic recrystallization (KDRX) can be observed. Optimum deformation conditions for both states are temperatures from 500 °C to 520 °C, and strain rates ranging from 0.01 s<sup>−1</sup> to 0.1 s<sup>−1</sup> for the as-cast material as well as a strain rate of 1 s<sup>−1</sup> for the TRC material.https://www.mdpi.com/1996-1944/14/13/3628flow curvedynamic recrystallisationprocessing mapLPSO phaseMg-6.8Y-2.5Zn-0.4Zrtwin-roll casting |
| spellingShingle | Kristina Kittner Madlen Ullmann Ulrich Prahl A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy Materials flow curve dynamic recrystallisation processing map LPSO phase Mg-6.8Y-2.5Zn-0.4Zr twin-roll casting |
| title | A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy |
| title_full | A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy |
| title_fullStr | A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy |
| title_full_unstemmed | A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy |
| title_short | A Comparative Study on the Hot Deformation Behavior of As-Cast and Twin-Roll Cast Mg-6.8Y-2.5Zn-0.4Zr Alloy |
| title_sort | comparative study on the hot deformation behavior of as cast and twin roll cast mg 6 8y 2 5zn 0 4zr alloy |
| topic | flow curve dynamic recrystallisation processing map LPSO phase Mg-6.8Y-2.5Zn-0.4Zr twin-roll casting |
| url | https://www.mdpi.com/1996-1944/14/13/3628 |
| work_keys_str_mv | AT kristinakittner acomparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy AT madlenullmann acomparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy AT ulrichprahl acomparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy AT kristinakittner comparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy AT madlenullmann comparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy AT ulrichprahl comparativestudyonthehotdeformationbehaviorofascastandtwinrollcastmg68y25zn04zralloy |