Use of femtosecond laser-induced breakdown spectroscopy (fs-LIBS) for micro-crack analysis on the surface

Wessel, W.; Brueckner-Foit, Angelika; Mildner, Jutta; Englert, Lars; Haag, Lars; Horn, Alexander; Wollenhaupt, M.; Baumert, Thomas

doi:10.1016/j.engfracmech.2010.03.020

Cited by 29 publications

(20 citation statements)

References 22 publications

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“…These cracks were initiated in flat small dog-bone specimens loaded in the HCF regime under fully reversed loading. Micro-notches made by femto-second laser ablation [2] were used as crack initiators. When the cracks had reached the length of some 100μm, the fatigue test was stopped and a miniaturized specimen with a cross section of about 400μm×400μm was cut which contained the cracks of interest in its gauge section (see Fig.…”

Section: Experimental Procedures and Microstructural Analysismentioning

confidence: 99%

Determination of Crack Face Displacement by X-ray Tomography and Digital Volume Correlation

Brueckner-Foit

Zeismann

Zellmer

2014

Procedia Engineering

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Physically small cracks in a ferritic martensitic steel were analyzed in the SPring-8 synchrotron facility. Change in the crack shape under static and cyclic loading could be determined in addition to the crack shape by mounting micro-specimens in an inbeam loading stage. Additional information can be gained by comparing three-dimensional images of the crack faces using volumetric digital image correlation. The displacement field on the crack faces is then available which, in turn, can be correlated to the microstructure determined by serial sectioning and orientation microscopy.

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Section: Experimental Procedures and Microstructural Analysismentioning

confidence: 99%

Determination of Crack Face Displacement by X-ray Tomography and Digital Volume Correlation

Brueckner-Foit

Zeismann

Zellmer

2014

Procedia Engineering

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“…[1] for the intermetallic TiAl alloy considered in this study. One shot produces a semispherical hole of about 1.4-1.6 μm diameter with the parameters described in Ref.…”

Section: E F I N I T I O N O F M I C R O N O T C H E Smentioning

confidence: 99%

“…1 Graded materials or material joints represent another case in which local crack growth data are needed. However, a large part of the lifetime of a component subjected to fatigue loading is spent in the small crack regime in which cracks strongly interact with the microstructure and long-crack data are not applicable.…”

Section: Introductionmentioning

confidence: 99%

“…Even though it is obvious that these defects will be eventually removed by optimizing the processing routine, it is not possible at this stage to estimate the material's potential resistance against stable extension of small cracks, unless a starter crack is introduced from which small cracks are initiated more rapidly than from the fabrication defects in question. 1 Graded materials or material joints represent another case in which local crack growth data are needed. Initiation and growth of small cracks can normally readily be observed in one phase (the soft one in general), but no observable cracks can be initiated in any of the other phases prior to failure of the specimen.…”

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confidence: 99%

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Micronotches for studying growth of small cracks

Wessel

Mildner

Pitz

et al. 2014

Fatigue Fract Eng Mat Struct

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Well‐defined starter cracks at preselected sites in the microstructures are needed for systematic investigation of the characteristic features of microstructure controlled growth of small cracks. A kinked ellipsoidal micronotch with very high notch factor at the trailing kink is proposed, which triggers controlled crack initiation along the notch contour. These micronotches can be machined by femtosecond laser ablation with virtually no heat‐affected zone at the edges. Crack growth results obtained for an intermetallic γ‐TiAl alloy are presented as an illustrative example.

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“…[18][19][20][21][22][23] While nanosecond (ns) lasers are commonly used for material sampling, 24,25 femtosecond (fs) lasers are more suitable for spatially-and depth-resolved chemical analysis because of the confined nature of the fs laser-material interaction associated with suppressed thermal effects. 14-17 LIBS allows bulk analysis as well as depth profiling, surface chemical mapping, and layer-by-layer analysis, all at atmospheric pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional elemental imaging of Li-ion solid-state electrolytes using fs-laser induced breakdown spectroscopy (LIBS)

Hou

Cheng

Richardson

et al. 2015

J. Anal. At. Spectrom.

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Direct chemical imaging is critical to understand and control processes that affect the performance and safety of Li-ion batteries. In this work, femtosecond-Laser Induced Breakdown Spectroscopy (fs-LIBS) is introduced for 3D chemical analysis of Li-ion solid state electrolytes in electrochemical energy storage systems. Spatially resolved chemical maps of major and minor elements in solid-state electrolyte Li 7 La 3 Zr 2 O 12 (LLZO) samples are presented, with a depth resolution of 700 nm. We implement newly-developed visualization techniques to chemically image the atomic ratio distributions in an LLZO solid-state electrolyte matrix. Statistical analysis, 2D layer-by-layer analysis, 2D cross-sectional imaging and 3D reconstruction of atomic ratios are demonstrated for electrolyte samples prepared under different processing conditions. These results explain the differences in the physical properties of the samples not revealed by conventional characterization techniques, and demonstrate the ability of fs-LIBS for direct 3D elemental imaging of Li-ion battery solid-state electrolytes.

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Use of femtosecond laser-induced breakdown spectroscopy (fs-LIBS) for micro-crack analysis on the surface

Cited by 29 publications

References 22 publications

Determination of Crack Face Displacement by X-ray Tomography and Digital Volume Correlation

Determination of Crack Face Displacement by X-ray Tomography and Digital Volume Correlation

Micronotches for studying growth of small cracks

Three-dimensional elemental imaging of Li-ion solid-state electrolytes using fs-laser induced breakdown spectroscopy (LIBS)

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