Elucidation of formation and transformation mechanisms of Ca-rich Laves phase 
in Mg–Al–Ca–Mn alloys

Li, Jiehua; Zhou, Xuyang; Breen, Andrew J.; Peng, Zirong; Su, Jing; Kürnsteiner, Philipp; Duarte, Maria Jazmin; Duarte Correa, Maria Jazmin; Lipińska-Chwałek, Marta; Wang, Huiyuan; Holec, David; Mayer, Joachim; Dehm, Gerhard

doi:10.1016/j.jallcom.2022.167177

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Elucidation of formation and transformation mechanisms of Ca-rich Laves phase in Mg–Al–Ca–Mn alloys

MPG-Autoren

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Li, Jiehua
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Dept. of Casting Research, Department of Metallurgy, University of Leoben, A-8700 Leoben, Austria;

/persons/resource/persons249272

Zhou, Xuyang
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Breen, Andrew J.
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons136394

Peng, Zirong
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons227770

Su, Jing
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons202883

Kürnsteiner, Philipp
Alloys for Additive Manufacturing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons125115

Duarte, Maria Jazmin
Hydrogen Mechanics and Interface Chemistry, Project Groups, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons125115

Duarte Correa, Maria Jazmin
Hydrogen Mechanics and Interface Chemistry, Project Groups, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

/persons/resource/persons75388

Dehm, Gerhard
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zitation

Li, J., Zhou, X., Breen, A. J., Peng, Z., Su, J., Kürnsteiner, P., et al. (2022). Elucidation of formation and transformation mechanisms of Ca-rich Laves phase in Mg–Al–Ca–Mn alloys. Journal of Alloys and Compounds, 928: 167177. doi:10.1016/j.jallcom.2022.167177.

Zitierlink: https://hdl.handle.net/21.11116/0000-000B-4CC1-6

Zusammenfassung

The formation of thermally stable intermetallic phases plays a key role to enable high temperature applications for Mg alloys. In the ductile Mg-Al-Ca system, Ca-rich Laves phases are expected to be crucial for improving high temperature mechanical properties. However, the formation mechanisms of Ca-rich Laves phases are still unresolved. Here, we report atomic-scale experiments and simulations on transformation of Ca-rich Laves phases and formation of Ca-rich clusters as well as Ca-segregation behaviour in Mg-Al-Ca-Mn alloys in three conditions: as-cast, homogenised (500 °C, 20 h), and rolled (350 °C). The formation mechanisms of C36 Laves phase and Mg-rich particles (eutectic Mg) within C36 Laves phase were attributed to a divorced eutectic reaction. The transformation mechanisms from C36 to C15 Laves phase were revealed and discussed in terms of Mg out-diffusion of C36 Laves phase, the partitioning of Al into C36 Laves phase and the change of stacking sequences. The combined atomic-scale experimental and simulation investigation reveals complex interactions among various Ca-rich Laves phases in Mg-Al-Ca-Mn alloys.