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

Petra Maier; Benjamin Wolfram; Jens Roggelin; Norbert Hort

doi:10.1007/978-3-031-81061-9_10

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

Petra Maier^*
, Benjamin Wolfram
, Jens Roggelin
, Norbert Hort

^*Corresponding author for this work

Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review

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 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.

Original language	English
Title of host publication	Magnesium Technology 2025
Editors	Domonkos Tolnai, Aaron Palumbo, Aeriel Leonard, Neale R. Neelameggham
Number of pages	10
Publisher	Springer Science and Business Media Deutschland
Publication date	2025
Pages	87-96
ISBN (Print)	978-3-031-81060-2, 978-3-031-81063-3, 978-3-031-81062-6
ISBN (Electronic)	978-3-031-81061-9
DOIs	https://doi.org/10.1007/978-3-031-81061-9_10
Publication status	Published - 2025
Event	Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025 - Las Vegas, United States Duration: 23.03.2025 → 27.03.2025

Bibliographical note

Publisher Copyright:
© The Minerals, Metals & Materials Society 2025.

Research areas and keywords

Crack propagation
Dendrites
Fatigue
Interdendritic second phases
Engineering

Access to Document

10.1007/978-3-031-81061-9_10

Cite this

Maier, P., Wolfram, B., Roggelin, J., & Hort, N. (2025). Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys. In D. Tolnai, A. Palumbo, A. Leonard, & N. R. Neelameggham (Eds.), Magnesium Technology 2025 (pp. 87-96). (Minerals, Metals and Materials Series). Springer Science and Business Media Deutschland. https://doi.org/10.1007/978-3-031-81061-9_10

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title = "Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys",

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 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.",

keywords = "Crack propagation, Dendrites, Fatigue, Interdendritic second phases, Engineering",

author = "Petra Maier and Benjamin Wolfram and Jens Roggelin and Norbert Hort",

note = "Publisher Copyright: {\textcopyright} The Minerals, Metals \& Materials Society 2025.; Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025 ; Conference date: 23-03-2025 Through 27-03-2025",

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language = "English",

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publisher = "Springer Science and Business Media Deutschland",

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Maier, P, Wolfram, B, Roggelin, J & Hort, N 2025, Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys. in D Tolnai, A Palumbo, A Leonard & NR Neelameggham (eds), Magnesium Technology 2025. Minerals, Metals and Materials Series, Springer Science and Business Media Deutschland, pp. 87-96, Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025, Las Vegas, Nevada, United States, 23.03.25. https://doi.org/10.1007/978-3-031-81061-9_10

Microstructure-Oriented Fatigue Crack Propagation in Two Cast Mg–Al–Ba–Ca Alloys. / Maier, Petra; Wolfram, Benjamin; Roggelin, Jens et al.
Magnesium Technology 2025. ed. / Domonkos Tolnai; Aaron Palumbo; Aeriel Leonard; Neale R. Neelameggham. Springer Science and Business Media Deutschland, 2025. p. 87-96 (Minerals, Metals and Materials Series).

Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review

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.

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KW - Fatigue

KW - Interdendritic second phases

KW - Engineering

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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

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 -

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

Abstract

Bibliographical note

Research areas and keywords

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