3D Time-Resolved Observations of Fatigue Crack Initiation and Growth from Corrosion Pits in Al 7XXX Alloys Using In Situ Synchrotron X-ray Tomography

Arun Sundar Sundaram Singaravelu, Jason J. Williams, Harsh Dev Goyal, Sridhar Niverty, Sudhanshu S. Singh, Tyler J. Stannard, Xianghui Xiao, Nikhilesh Chawla

Research output: Contribution to journalArticle

Abstract

In situ three-dimensional X-ray synchrotron tomography was used to visualize and quantify the fatigue crack initiation and growth from corrosion pits in high strength aluminum alloys. Corrosion pitted Al 7075 and Al 7475 samples of peak-aged, over-aged, and highly over-aged conditions were prepared by soaking in 3.5 wt pct NaCl solution for fifteen days. These samples were fatigue tested in situ in 3.5 wt pct NaCl solution using synchrotron X-ray tomography to analyze the fatigue crack initiation and growth characteristics (4D). Increases in maximum pit depth and fatigue crack growth rate variability were found with increased aging. A detailed analysis of crack morphology and deflection, as a function of aging, was carried out and it discussed.

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crack initiation
Synchrotrons
Crack initiation
Tomography
Crack propagation
corrosion
synchrotrons
tomography
Aging of materials
Corrosion
X rays
High strength alloys
cracks
Fatigue crack propagation
high strength alloys
Aluminum alloys
x rays
soaking
Fatigue of materials
Cracks

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

3D Time-Resolved Observations of Fatigue Crack Initiation and Growth from Corrosion Pits in Al 7XXX Alloys Using In Situ Synchrotron X-ray Tomography. / Singaravelu, Arun Sundar Sundaram; Williams, Jason J.; Goyal, Harsh Dev; Niverty, Sridhar; Singh, Sudhanshu S.; Stannard, Tyler J.; Xiao, Xianghui; Chawla, Nikhilesh.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 01.01.2019.

Research output: Contribution to journalArticle

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abstract = "In situ three-dimensional X-ray synchrotron tomography was used to visualize and quantify the fatigue crack initiation and growth from corrosion pits in high strength aluminum alloys. Corrosion pitted Al 7075 and Al 7475 samples of peak-aged, over-aged, and highly over-aged conditions were prepared by soaking in 3.5 wt pct NaCl solution for fifteen days. These samples were fatigue tested in situ in 3.5 wt pct NaCl solution using synchrotron X-ray tomography to analyze the fatigue crack initiation and growth characteristics (4D). Increases in maximum pit depth and fatigue crack growth rate variability were found with increased aging. A detailed analysis of crack morphology and deflection, as a function of aging, was carried out and it discussed.",
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AU - Williams, Jason J.

AU - Goyal, Harsh Dev

AU - Niverty, Sridhar

AU - Singh, Sudhanshu S.

AU - Stannard, Tyler J.

AU - Xiao, Xianghui

AU - Chawla, Nikhilesh

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AB - In situ three-dimensional X-ray synchrotron tomography was used to visualize and quantify the fatigue crack initiation and growth from corrosion pits in high strength aluminum alloys. Corrosion pitted Al 7075 and Al 7475 samples of peak-aged, over-aged, and highly over-aged conditions were prepared by soaking in 3.5 wt pct NaCl solution for fifteen days. These samples were fatigue tested in situ in 3.5 wt pct NaCl solution using synchrotron X-ray tomography to analyze the fatigue crack initiation and growth characteristics (4D). Increases in maximum pit depth and fatigue crack growth rate variability were found with increased aging. A detailed analysis of crack morphology and deflection, as a function of aging, was carried out and it discussed.

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