In Situ Nano-Indentation of a Gold Sub-Micrometric Particle Imaged by Multi-Wavelength Bragg Coherent X-ray Diffraction
- Aix-Marseille Univ., Marseille (France); Univ. de Toulon, Marseille (France)
- Aix-Marseille Univ., Marseille (France); Univ. de Toulon, Marseille (France); European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- European Synchrotron Radiation Facility (ESRF), Grenoble (France); Argonne National Lab. (ANL), Argonne, IL (United States)
- Technion-Israel Institute of Technology, Haifa (Israel)
The microstructure of a sub-micrometric gold crystal during nanoindentation is visualized by in situ multi-wavelength Bragg coherent X-ray diffraction imaging. The gold crystal is indented using a custom-built atomic force microscope. A band of deformation attributed to a shear band oriented along the (221) lattice plane is nucleated at the lower left corner of the crystal and propagates towards the crystal center with increasing applied mechanical load. After complete unloading, an almost strain-free and defect-free crystal is left behind, demonstrating a pseudo-elastic behavior that can only be studied by in situ imaging while it is invisible to ex situ examinations. The recovery is probably associated with reversible dislocations nucleation/annihilation at the side surface of the particle and at the particle-substrate interface, a behavior that has been predicted by atomistic simulations. The full recovery of the particle upon unloading sheds new light on extraordinary mechanical properties of metal nanoparticles obtained by solid-state dewetting.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; European Synchrotron Radiation Facility (ESRF)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1886060
- Journal Information:
- Materials, Vol. 15, Issue 18; ISSN 1996-1944
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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