Room temperature deformation mechanisms of alumina particles observed from in situ micro-compression and atomistic simulations.

Sarobol, Pylin; Chandross, Michael E.; Carroll, Jay D.; Mook, William M.; Bufford, Daniel Charles; Boyce, Brad L.; Hattar, Khalid Mikhiel; Kotula, Paul G.; Hall, Aaron Christopher

doi:10.1007/s11666-015-0295-2

Room temperature deformation mechanisms of alumina particles observed from in situ micro-compression and atomistic simulations.

Journal Article · Tue Sep 22 00:00:00 EDT 2015 · Journal of Thermal Spray Technology

DOI:https://doi.org/10.1007/s11666-015-0295-2· OSTI ID:1237699

Sarobol, Pylin ^[1]; Chandross, Michael E. ^[1]; Carroll, Jay D. ^[1]; Mook, William M. ^[1]; Bufford, Daniel Charles ^[1]; Boyce, Brad L. ^[1]; Hattar, Khalid Mikhiel ^[1]; Kotula, Paul G. ^[1]; Hall, Aaron Christopher ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Aerosol deposition (AD) is a solid-state deposition technology that has been developed to fabricate ceramic coatings nominally at room temperature. Sub-micron ceramic particles accelerated by pressurized gas impact, deform, and consolidate on substrates under vacuum. Ceramic particle consolidation in AD coatings is highly dependent on particle deformation and bonding; these behaviors are not well understood. In this work, atomistic simulations and in situ micro-compressions in the scanning electron microscope, and the transmission electron microscope (TEM) were utilized to investigate fundamental mechanisms responsible for plastic deformation/fracture of particles under applied compression. Results showed that highly defective micron-sized alumina particles, initially containing numerous dislocations or a grain boundary, exhibited no observable shape change before fracture/fragmentation. Simulations and experimental results indicated that particles containing a grain boundary only accommodate low strain energy per unit volume before crack nucleation and propagation. In contrast, nearly defect-free, sub-micron, single crystal alumina particles exhibited plastic deformation and fracture without fragmentation. Dislocation nucleation/motion, significant plastic deformation, and shape change were observed. Simulation and TEM in situ micro-compression results indicated that nearly defect-free particles accommodate high strain energy per unit volume associated with dislocation plasticity before fracture. As a result, the identified deformation mechanisms provide insight into feedstock design for AD.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1237699

Report Number(s):: SAND--2015-7094J; 603168

Journal Information:: Journal of Thermal Spray Technology, Journal Name: Journal of Thermal Spray Technology Journal Issue: 1-2 Vol. 25; ISSN 1059-9630

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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