Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire
Due to their low density and high specific strength, magnesium alloys offer great potential as a design material for lightweight construction. An economical and energy-efficient method for the production of magnesium wire is the technology of twin-roll casting. In this work, the deformation behaviou...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-01-01
|
| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/12/2/173 |
| _version_ | 1797481492804272128 |
|---|---|
| author | Falko Arndt Susanne Berndorf Marie Moses Madlen Ullmann Ulrich Prahl |
| author_facet | Falko Arndt Susanne Berndorf Marie Moses Madlen Ullmann Ulrich Prahl |
| author_sort | Falko Arndt |
| collection | DOAJ |
| description | Due to their low density and high specific strength, magnesium alloys offer great potential as a design material for lightweight construction. An economical and energy-efficient method for the production of magnesium wire is the technology of twin-roll casting. In this work, the deformation behaviour of twin-roll cast and heat-treated AZ31 wire pre-profile is investigated for the first time during the compression test at different temperatures (250–400 °C) and forming speeds (0.01–10 s<sup>−1</sup>). To obtain optimal parameters, a processing map is created, and the microstructural changes during the hot forming processes are determined by accompanying microstructure characterization through an optical microscope and scanning electron microscope. The heat treatment causes a reduction in segregation and a homogeneous microstructure. The average activating energy for plastic deformation of twin-roll cast and heat-treated magnesium alloy AZ31 is 159.008 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mi>kJ</mi><mo>·</mo></mrow><msup><mrow><mi>mol</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The instability region of the process map starts at a forming temperature of 250 °C and extends into the range of high forming speeds (1–10 s<sup>−1</sup>). In this area, cracks in the microstructure can be detected during hot forming. At high temperatures (300–350 °C), dynamic recrystallization at the grain boundaries is observed as the main forming mechanism. Based on these results and observations, existing models for describing the hot forming behaviour of magnesium alloys can be extended and validated. |
| first_indexed | 2024-03-09T22:15:25Z |
| format | Article |
| id | doaj.art-853222ffc02a4c76b0d41c7042323b87 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T22:15:25Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-853222ffc02a4c76b0d41c7042323b872023-11-23T19:24:05ZengMDPI AGCrystals2073-43522022-01-0112217310.3390/cryst12020173Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium WireFalko Arndt0Susanne Berndorf1Marie Moses2Madlen Ullmann3Ulrich Prahl4Institute 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, 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, GermanyDue to their low density and high specific strength, magnesium alloys offer great potential as a design material for lightweight construction. An economical and energy-efficient method for the production of magnesium wire is the technology of twin-roll casting. In this work, the deformation behaviour of twin-roll cast and heat-treated AZ31 wire pre-profile is investigated for the first time during the compression test at different temperatures (250–400 °C) and forming speeds (0.01–10 s<sup>−1</sup>). To obtain optimal parameters, a processing map is created, and the microstructural changes during the hot forming processes are determined by accompanying microstructure characterization through an optical microscope and scanning electron microscope. The heat treatment causes a reduction in segregation and a homogeneous microstructure. The average activating energy for plastic deformation of twin-roll cast and heat-treated magnesium alloy AZ31 is 159.008 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mi>kJ</mi><mo>·</mo></mrow><msup><mrow><mi>mol</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The instability region of the process map starts at a forming temperature of 250 °C and extends into the range of high forming speeds (1–10 s<sup>−1</sup>). In this area, cracks in the microstructure can be detected during hot forming. At high temperatures (300–350 °C), dynamic recrystallization at the grain boundaries is observed as the main forming mechanism. Based on these results and observations, existing models for describing the hot forming behaviour of magnesium alloys can be extended and validated.https://www.mdpi.com/2073-4352/12/2/173twin-roll castingwiremagnesium alloyAZ31flow curveprocessing map |
| spellingShingle | Falko Arndt Susanne Berndorf Marie Moses Madlen Ullmann Ulrich Prahl Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire Crystals twin-roll casting wire magnesium alloy AZ31 flow curve processing map |
| title | Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire |
| title_full | Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire |
| title_fullStr | Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire |
| title_full_unstemmed | Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire |
| title_short | Microstructure and Hot Deformation Behaviour of Twin-Roll Cast AZ31 Magnesium Wire |
| title_sort | microstructure and hot deformation behaviour of twin roll cast az31 magnesium wire |
| topic | twin-roll casting wire magnesium alloy AZ31 flow curve processing map |
| url | https://www.mdpi.com/2073-4352/12/2/173 |
| work_keys_str_mv | AT falkoarndt microstructureandhotdeformationbehaviouroftwinrollcastaz31magnesiumwire AT susanneberndorf microstructureandhotdeformationbehaviouroftwinrollcastaz31magnesiumwire AT mariemoses microstructureandhotdeformationbehaviouroftwinrollcastaz31magnesiumwire AT madlenullmann microstructureandhotdeformationbehaviouroftwinrollcastaz31magnesiumwire AT ulrichprahl microstructureandhotdeformationbehaviouroftwinrollcastaz31magnesiumwire |