Understanding Local Strength and Fracture Toughness Through Micro- and Nano-mechanical Testing

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Understanding Local Strength and Fracture Toughness Through Micro- and Nano-mechanical Testing

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Author(s): Kevin M. Schmalbach ¹ ^, , Eric D. Hintsala ¹ , Frank W. DelRio ² , Scott J. Grutzik ² , William M. Mook ² , Sara M. Dickens ² , Paul G. Kotula ² , Sanjit Bhowmick ¹ , Douglas D. Stauffer ¹ , Brad L. Boyce ²

Publication date (Electronic): 21 January 2025

Conference name: 13th Asia Pacific Microscopy Congress 2025 (APMC13)

Conference date: 2-7 Febuary 2025

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Abstract

In situ nanomechanical tests often require high-precision alignment of the specimen geometry with the indenter probe or an electron microscope detector to accurately characterize the material properties and structure. Here, we present two case studies which emphasize the use of a dual axis specimen rotation and tilt (R/T) stage along with the PI 89 Picoindenter to investigate material mechanical behavior via in situ micro- and nano-mechanical testing.

In the first case study, we present microscale fracture of single crystal silicon via wedge-loaded double cantilever beams [ 1]. The use of a dual axis R/T stage allows the user to precisely control the relative rotation of the notched specimen with the wedge probe, which is critical to ensure mode I loading. Wedge loading of the geometry elicits stable crack growth along a {111} plane, which created hackle and arrest lines along the crack path and allowed for the determination of the crack resistance curve. An example of a loaded specimen with corresponding load-displacement curve, showing multiple load drops consistent with multiple arrest events, can be seen in Figure 1 . This method possesses both high accuracy and precision after accounting for contact friction.

In the second case study, we present accelerated correlative nanoindentation and electron microscopy.

Here, we use the dual axis R/T stage to orient the specimen in the SEM to conduct local chemistry characterization via energy dispersive spectroscopy (EDS), microstructure identification via electron backscatter diffraction (EBSD), and nanoindentation to assess site-specific mechanical properties. We use this system to investigate the structure-processing-mechanical property relations across several phases of a laser clad steel.

Figure 1

(a) Frame from in situ video of the wedge loading of a single crystal silicon double cantilever beam showing the linear crack path; (b) the load-displacement response of the test shown in (a), showing multiple load drops corresponding to multiple cycles of crack propagation and arrest. Figure adapted from [ 1].

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Publication date (Electronic): 21 January 2025

Electronic Location Identifier: e256

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[1 ]Bruker, Eden Prairie, MN, USA

[2 ]Sandia National Laboratories, Albuquerque, NM, USA

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*Corresponding author: Kevin.Schmalbach@ 123456bruker.com

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Kevin M. Schmalbach https://orcid.org/0000-0002-4824-9900

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DOI: 10.14293/APMC13-2025-0256

SO-VID: 09070781-846b-4d2a-825a-a1ef8f5aacf9

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Published under Creative Commons Attribution 4.0 International ( CC BY 4.0). Users are allowed to share (copy and redistribute the material in any medium or format) and adapt (remix, transform, and build upon the material for any purpose, even commercially), as long as the authors and the publisher are explicitly identified and properly acknowledged as the original source.

Conference name: 13th Asia Pacific Microscopy Congress 2025

Conference acronym: APMC13

Conference number: 13

Conference location: Brisbane, Australia

Conference date: 2-7 Febuary 2025

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References

F.W. Delrio et al, Materials Research Letters 10 (2022) 728–735. https://doi.org/10.1080/21663831.2022.2088251.

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[1] F.W. Delrio et al, Materials Research Letters 10 (2022) 728–735. https://doi.org/10.1080/21663831.2022.2088251.

Understanding Local Strength and Fracture Toughness Through Micro- and Nano-mechanical Testing

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