Development of new alloy systems and innovative processing technologies for the production of magnesium flat products with excellent property profile

Ullmann, Madlen; Kittner, Kristina; Henseler, Thorsten; Stöcker, Anett; Prahl, Ulrich; Kawalla, Rudolf

doi:10.1016/j.promfg.2018.12.065

Cited by 12 publications

(15 citation statements)

References 17 publications

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“…Twin roll casting of ZAX210 leads to the formation of the characteristic microstructure, which develops during TRC and is well investigated for the magnesium alloy AZ31 [1,29]. Due to the superimposed solidification and forming processes, the alloy exhibits an inhomogeneous microstructure [25]. The morphology of the microstructure is significantly influenced by the processing parameters.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, TRC strips (for example AZ31 alloy) exhibit a low basal texture due to the directional growth of columnar grains [32]. Results of the influence of a heat treatment on the resulting microstructure of a TRC state ZAX210 in comparison to other magnesium alloys are shown in [25]. The texture of the TRC strip originates from the rolling deformation, which is associated with the TRC process.…”

Section: Discussionmentioning

confidence: 99%

“…( a ) Microstructure of the TRC (twin roll cast) state ZAX210 [25], divided into three characteristic sections through thickness cross-section and ( b ) scanning electron micrograph, results of the XRD analysis (X-ray diffraction) and chemical composition of structural constituents according to marking in SEM (scanning electron microscope) image determined via EDX analysis (energy dispersive X-ray spectroscopy) for the ZAX210 in TRC condition [30]. …”

Section: Figurementioning

confidence: 99%

“…The sheets offer a fine grained and homogenous microstructure and a texture similar to the RE-containing alloy ZE10. Twin roll casting and hot rolling of ZAX210 are also part of the studies of Ullmann et al [25]. The authors conclude that the good formability of the ZAX210 sheets is due to the weakening of the texture, which originates from the recrystallization process during hot rolling were Ca induces particle stimulated nucleation.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

et al. 2019

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In the present work, the microstructure, texture, mechanical properties as well as hot deformation behavior of a Mg-2Zn-1Al-0.3Ca sheet manufactured by twin roll casting were investigated. The twin roll cast state reveals a dendritic microstructure with intermetallic compounds predominantly located in the interdendritic areas. The twin roll cast samples were annealed at 420 °C for 2 h followed by plane strain compression tests in order to study the hardening and softening behavior. Annealing treatment leads to the formation of a grain structure, consisting of equiaxed grains with an average diameter of approximately 19 µm. The twin roll cast state reveals a typical basal texture and the annealed state shows a weakened texture, by spreading basal poles along the transverse direction. The twin roll cast Mg-2Zn-1Al-0.3Ca alloy offers a good ultimate tensile strength of 240 MPa. The course of the flow curves indicate that dynamic recrystallization occurs during hot deformation. For the validity range from 250 °C to 450 °C as well as equivalent logarithmic strain rates from 0.01 s−1 to 10 s−1 calculated model coefficients are shown. The average activation energy for plastic flow of the twin roll cast and annealed Mg-2Zn-1Al-0.3Ca alloy amounts to 180.5 kJ/mol. The processing map reveals one domain with flow instability at temperatures above 370 °C and strain rates ranging from 3 s−1 to 10 s−1. Under these forming conditions, intergranular cracks arose and grew along the grain boundaries.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

et al. 2019

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“…It is well known that temperature will play a crucial role in the metal forming process. In particular, during the forming of magnesium alloys, the grain organization as well as the mechanical properties of the sheet will change significantly with the change in temperature [22]. Other scholars have found that the activation of dynamic recovery, continuous dynamic recrystallization, grain boundary sliding and additional slip systems lead to improved ductility of magnesium alloys at high temperatures [23].…”

Section: Effect Of Process Parameters On Temperature Of Plate Edgementioning

confidence: 99%

Effect of casting and rolling process parameters on solidification welding line of magnesium alloy

Lai

Zhou

Guo

2022

J min metall B Metall

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Process of horizontal twin roll casting magnesium alloy was analyzed by numerical simulation. Taking solidification welding line in cast rolling area as research object, the characteristic change of solidification welding line caused by casting rolling temperature, casting rolling speed and roll heat transfer capacity and its influence on the forming process of casting rolling area were analyzed. The results show that increasing casting temperature, casting speed or reducing heat transfer capacity of roll can make solidification welding line shift to exit of casting rolling zone. Increasing casting temperature and casting speed will increase difference between middle and edge of the solidification welding line along casting direction. And heat distribution of whole slab is more uniform. However, effect of improving heat transfer capacity of roll is completely opposite. According to this, optimum process parameters of casting and rolling magnesium alloy with plate thickness of 6 mm are put forward to reduce probability of edge crack.

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Influence of Twin-Roll Casting Speed on Microstructural Homogeneity, Centerline Segregation, and Surface Quality of Three Different Mg Alloys

Victoria-Hernández

Kurz

Bohlen

et al. 2021

JOM

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In this work, the influence of twin-roll casting (TRC) speed on the microstructure of the through-thickness uniformity, centerline segregation, and surface quality of three wrought Mg alloys was investigated. The microstructural features of the AZ31, ZX11, and ZWK200 alloys produced at TRC speeds ranging from 1.8 m/min to 2.2 m/min (for the AZ31 and ZWK200), and 1.5–2.5 m/min (for the ZX11 alloy) were analyzed. There were clear differences in the microstructure uniformity depending on the alloy composition. Columnar grains coexisting with globular grains were found in the AZ31 and ZX11 alloys, whereas the ZWK200 alloy showed a homogeneous fine-grained microstructure characterized by a weaker texture even at the highest TRC speed used. While there is a tendency to reduce the centerline segregation as the TRC speed is decreased during casting of the AZ31 alloy, the formation of this defect cannot be prevented in the ZX11 and ZWK200 alloys by only varying the TRC speed.

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Development of new alloy systems and innovative processing technologies for the production of magnesium flat products with excellent property profile

Cited by 12 publications

References 17 publications

Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

Effect of casting and rolling process parameters on solidification welding line of magnesium alloy

Influence of Twin-Roll Casting Speed on Microstructural Homogeneity, Centerline Segregation, and Surface Quality of Three Different Mg Alloys

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