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

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

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

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.

OriginalspracheEnglisch
Aufsatznummer167177
Seiten (von - bis)1-12
Seitenumfang12
FachzeitschriftJournal of alloys and compounds
Jahrgang928.2022
Ausgabenummer20 December
Frühes Online-Datum15 Sept. 2022
DOIs
PublikationsstatusVeröffentlicht - 20 Dez. 2022

Bibliographische Notiz

Funding Information:
J.H. Li acknowledges the host from Prof Dierk Raabe, technical support from the staffs, the APT help from Junyang He and Baptiste Gault in Max-Planck Institut für Eisenforschung and the financial support from Humboldt Research Fellowships for Experienced Researcher, Austrian Science Fund (No. P 32378-N37), BMBWF (KR 06/2020). X. Zhou is supported by the Alexander von Humboldt-Stiftung. The DFT computational results have been achieved using the Vienna Scientific Cluster (VSC). Marta Lipińska-Chwałek, Joachim Mayer and Gerhard Dehm acknowledge the financial support from the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Centre SFB 1394: Structural and Chemical Atomic Complexity - From Defect Phase Diagrams to Material Properties, project ID 409476157. STEM experiments were performed at the Ernst Ruska-Center (ER-C) for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich (FZJ) in Germany. The ER-C beam-time access for J.H. Li was provided via the DFG Core Facility Project ER-C D-030 and funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 823717-ESTEEM3 (ID 543). The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding Information:
J.H. Li acknowledges the host from Prof Dierk Raabe, technical support from the staffs, the APT help from Junyang He and Baptiste Gault in Max-Planck Institut für Eisenforschung and the financial support from Humboldt Research Fellowships for Experienced Researcher, Austrian Science Fund (No. P 32378-N37 ), BMBWF ( KR 06/2020 ). X. Zhou is supported by the Alexander von Humboldt-Stiftung. The DFT computational results have been achieved using the Vienna Scientific Cluster (VSC). Marta Lipińska-Chwałek, Joachim Mayer and Gerhard Dehm acknowledge the financial support from the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Centre SFB 1394: Structural and Chemical Atomic Complexity - From Defect Phase Diagrams to Material Properties , project ID 409476157 . STEM experiments were performed at the Ernst Ruska-Center (ER-C) for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich (FZJ) in Germany. The ER-C beam-time access for J.H. Li was provided via the DFG Core Facility Project ER-C D-030 and funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 823717-ESTEEM3 (ID 543).

Publisher Copyright:
© 2022 The Author(s)

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