Elucidation of formation and transformation mechanisms of Ca-rich Laves phase in Mg-Al-Ca-Mn alloys
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in: Journal of alloys and compounds, Jahrgang 928.2022, Nr. 20 December, 167177, 20.12.2022, S. 1-12.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Elucidation of formation and transformation mechanisms of Ca-rich Laves phase in Mg-Al-Ca-Mn alloys
AU - LI, Jiehua
AU - Zhou, Xuyang
AU - Breen, Andrew
AU - Peng, Zirong
AU - Su, Jing
AU - Kürnsteiner, Philipp
AU - Correa, Maria Jazmin Duarte
AU - Chwałek, Marta Lipińska
AU - Wang, Huiyuan
AU - Holec, David
AU - Mayer, Joachim
AU - Dehm, Gerhard
N1 - Publisher Copyright: © 2022 The Author(s)
PY - 2022/12/20
Y1 - 2022/12/20
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85138020727&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2022.167177
DO - 10.1016/j.jallcom.2022.167177
M3 - Article
VL - 928.2022
SP - 1
EP - 12
JO - Journal of alloys and compounds
JF - Journal of alloys and compounds
SN - 0925-8388
IS - 20 December
M1 - 167177
ER -
