Three-dimensional in situ observations of short fatigue crack growth in magnesium

A. King; W. Ludwig; M. Herbig; J. Y. Buffire; A. A. Khan; N. Stevens; T. J. Marrow

doi:10.1016/j.actamat.2011.07.034

Three-dimensional in situ observations of short fatigue crack growth in magnesium

A. King, W. Ludwig, M. Herbig, J. Y. Buffire, A. A. Khan, N. Stevens, T. J. Marrow

Research output: Contribution to journal › Article › peer-review

Abstract

Three-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle-1. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917). © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	6761-6771
Number of pages	10
Journal	Acta Materialia
Volume	59
Issue number	17
DOIs	https://doi.org/10.1016/j.actamat.2011.07.034
Publication status	Published - Oct 2011

Keywords

Fatigue
Grain boundary structure
Magnesium alloys
X-ray diffraction

Access to Document

10.1016/j.actamat.2011.07.034

http://www.sciencedirect.com/science/article/pii/S1359645411005106

Cite this

@article{8c73c35a30f74cdcaaf8241076c086b8,

title = "Three-dimensional in situ observations of short fatigue crack growth in magnesium",

abstract = "Three-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle-1. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917). {\textcopyright} 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",

keywords = "Fatigue, Grain boundary structure, Magnesium alloys, X-ray diffraction",

author = "A. King and W. Ludwig and M. Herbig and Buffire, {J. Y.} and Khan, {A. A.} and N. Stevens and Marrow, {T. J.}",

year = "2011",

month = oct,

doi = "10.1016/j.actamat.2011.07.034",

language = "English",

volume = "59",

pages = "6761--6771",

journal = "Acta Materialia",

issn = "1873-2453",

publisher = "Acta Materialia Inc",

number = "17",

}

TY - JOUR

T1 - Three-dimensional in situ observations of short fatigue crack growth in magnesium

AU - King, A.

AU - Ludwig, W.

AU - Herbig, M.

AU - Buffire, J. Y.

AU - Khan, A. A.

AU - Stevens, N.

AU - Marrow, T. J.

PY - 2011/10

Y1 - 2011/10

N2 - Three-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle-1. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917). © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

AB - Three-dimensional (3D) short fatigue crack growth behaviour in a cast magnesium alloy, Elektron 21, was studied using a combination of X-ray diffraction contrast tomography (DCT) and microtomography at the European Synchrotron Radiation Facility. A 3D map of grain shapes and crystallographic orientations was produced in a miniature fatigue specimen using DCT. A focused ion beam instrument was used to introduce small notches in selected grains. Synchrotron microtomography was used to study the evolution of fatigue cracks from these notches during interrupted in situ fatigue cycling. Stage I crack growth occurred preferentially on the basal plane of the magnesium hexagonal close packed crystal, with local crack growth rates between 4 and 40 nm cycle-1. Retardations in the local crack growth rate were observed in certain grains and at certain grain boundaries. The observed interactions between the crack and the polycrystalline microstructure can be explained using Schmid factors and a development of the tilt-twist model of Zhai and Wilkinson (Zhai T, Wilkinson AJ, Martin JW. Acta Mater 2000;48;4917). © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

KW - Fatigue

KW - Grain boundary structure

KW - Magnesium alloys

KW - X-ray diffraction

U2 - 10.1016/j.actamat.2011.07.034

DO - 10.1016/j.actamat.2011.07.034

M3 - Article

SN - 1873-2453

VL - 59

SP - 6761

EP - 6771

JO - Acta Materialia

JF - Acta Materialia

IS - 17

ER -

Three-dimensional in situ observations of short fatigue crack growth in magnesium

Abstract

Keywords

Access to Document

Fingerprint

Cite this