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Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys

Maier, Petra LU ; Wolfram, Benjamin ; Roggelin, Jens and Hort, Norbert (2025) Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025 In Minerals, Metals and Materials Series p.87-96
Abstract

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... (More)

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.

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Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Crack propagation, Dendrites, Fatigue, Interdendritic second phases
host publication
Magnesium Technology 2025
series title
Minerals, Metals and Materials Series
editor
Tolnai, Domonkos ; Palumbo, Aaron ; Leonard, Aeriel and Neelameggham, Neale R.
pages
10 pages
publisher
Springer Science and Business Media B.V.
conference name
Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025
conference location
Las Vegas, United States
conference dates
2025-03-23 - 2025-03-27
external identifiers
  • scopus:86000450580
ISSN
2367-1696
2367-1181
ISBN
9783031810602
DOI
10.1007/978-3-031-81061-9_10
language
English
LU publication?
yes
id
ae8e7012-2602-45a5-94da-c5067b43ab2b
date added to LUP
2025-06-27 12:18:25
date last changed
2025-07-11 12:50:49
@inproceedings{ae8e7012-2602-45a5-94da-c5067b43ab2b,
  abstract     = {{<p>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 Al<sub>2</sub>Ca, and of a hard, compact and brittle interdendritic Ba-rich phase, the Mg<sub>21</sub>Al<sub>3</sub>Ba<sub>2</sub> 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.</p>}},
  author       = {{Maier, Petra and Wolfram, Benjamin and Roggelin, Jens and Hort, Norbert}},
  booktitle    = {{Magnesium Technology 2025}},
  editor       = {{Tolnai, Domonkos and Palumbo, Aaron and Leonard, Aeriel and Neelameggham, Neale R.}},
  isbn         = {{9783031810602}},
  issn         = {{2367-1696}},
  keywords     = {{Crack propagation; Dendrites; Fatigue; Interdendritic second phases}},
  language     = {{eng}},
  pages        = {{87--96}},
  publisher    = {{Springer Science and Business Media B.V.}},
  series       = {{Minerals, Metals and Materials Series}},
  title        = {{Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys}},
  url          = {{http://dx.doi.org/10.1007/978-3-031-81061-9_10}},
  doi          = {{10.1007/978-3-031-81061-9_10}},
  year         = {{2025}},
}