Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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Magnesium Technology 2025. Hrsg. / Domonkos Tolnai; Aaron Palumbo; Aeriel Leonard; Neale R. Neelameggham. Springer Science and Business Media Deutschland GmbH, 2025. S. 87-96 (Minerals, Metals and Materials Series).
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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TY - CHAP
T1 - Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys
AU - Maier, Petra
AU - Wolfram, Benjamin
AU - Roggelin, Jens
AU - Hort, Norbert
N1 - Publisher Copyright: © The Minerals, Metals & Materials Society 2025.
PY - 2025
Y1 - 2025
N2 - Two cast Mg–Al–Ba–Ca alloys, DieMag633 and DieMag844, are the focus of this study. Their microstructureMicrostructure consists of a eutectic Ca-rich structure, the lamellar Al2Ca, and of a hard, compact and brittle interdendritic Ba-rich phase, the Mg21Al3Ba2 phase. Both phases have a much higher hardness than the α-Mg matrix and strongly influence the crack propagationCrack propagation under quasi-static and fatigueFatigue loading. Mostly interdendritic crack propagationCrack propagation has been found—the crack growth follows the coherent interdentritic network of second phases. Transgranular cracking within the compact Ba-rich phase is very pronounced, showing many microcracks within this phase. The phases strain harden in a different amount. Transdendritic cracks are found only under cyclic fatigueFatigue loading, and the cracks transit from the second phases into the α-Mg dendritesDendrites. The lower crack growth rate and the stress increase at the interface to the dendritesDendrites seem responsible for the transdentritc crack propagationCrack propagation. The influence of the chemical composition of the alloying elements and the fatigueFatigue stress ratios are discussed.
AB - Two cast Mg–Al–Ba–Ca alloys, DieMag633 and DieMag844, are the focus of this study. Their microstructureMicrostructure consists of a eutectic Ca-rich structure, the lamellar Al2Ca, and of a hard, compact and brittle interdendritic Ba-rich phase, the Mg21Al3Ba2 phase. Both phases have a much higher hardness than the α-Mg matrix and strongly influence the crack propagationCrack propagation under quasi-static and fatigueFatigue loading. Mostly interdendritic crack propagationCrack propagation has been found—the crack growth follows the coherent interdentritic network of second phases. Transgranular cracking within the compact Ba-rich phase is very pronounced, showing many microcracks within this phase. The phases strain harden in a different amount. Transdendritic cracks are found only under cyclic fatigueFatigue loading, and the cracks transit from the second phases into the α-Mg dendritesDendrites. The lower crack growth rate and the stress increase at the interface to the dendritesDendrites seem responsible for the transdentritc crack propagationCrack propagation. The influence of the chemical composition of the alloying elements and the fatigueFatigue stress ratios are discussed.
KW - Crack propagation
KW - Dendrites
KW - Fatigue
KW - Interdendritic second phases
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=86000450580&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-81061-9_10
DO - 10.1007/978-3-031-81061-9_10
M3 - Article in conference proceedings
AN - SCOPUS:86000450580
SN - 978-3-031-81060-2
SN - 978-3-031-81063-3
SN - 978-3-031-81062-6
T3 - Minerals, Metals and Materials Series
SP - 87
EP - 96
BT - Magnesium Technology 2025
A2 - Tolnai, Domonkos
A2 - Palumbo, Aaron
A2 - Leonard, Aeriel
A2 - Neelameggham, Neale R.
PB - Springer Science and Business Media Deutschland GmbH
T2 - Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025
Y2 - 23 March 2025 through 27 March 2025
ER -