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

Journal Article · · Journal of Thermal Spray Technology

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.

Research Organization:
Sandia National Lab. (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, Vol. 25, Issue 1-2; ISSN 1059-9630
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

References (31)

Aerosol Deposition of Ceramic Thick Films at Room Temperature: Densification Mechanism of Ceramic Layers journal June 2006
Aerosol deposition for post-LTCC journal January 2007
Aerosol Deposition Method for Fabrication of Nano Crystal Ceramic Layer journal March 2004
Powder preparation for 0.5 Pb(Ni1/3Nb2/3)O3–0.15 PbZrO3–0.35PbTiO3 thick films by the aerosol deposition method journal February 2005
Piezoelectric properties and poling effect of Pb(Zr, Ti)O3 thick films prepared for microactuators by aerosol deposition journal September 2000
Magnetic properties of Sm-Fe-N thick film magnets prepared by the aerosol deposition method journal September 2003
Effect of applied field during aerosol deposition on the anisotropy of Sm–Fe–N thick films journal April 2005
Deposition mechanism of dry sprayed ceramic particles at room temperature using a nano-particle deposition system journal April 2011
Shock-induced plasticity and fragmentation phenomena during alumina deposition in the vacuum kinetic spraying process journal April 2015
Influence of Carrier Gas Composition on the Stress of Al2O3 Coatings Prepared by the Aerosol Deposition Method journal August 2014
Multi-layer TiO2 films prepared by aerosol deposition method for dye-sensitized solar cells journal November 2013
Enhanced heat transfer by room temperature deposition of AlN film on aluminum for a light emitting diode package journal January 2013
Aerosol Codeposition of Ceramics: Mixtures of Bi 2 O 3 -TiO 2 and Bi 2 O 3 -V 2 O 5 journal December 2014
Size-Dependent Pressure-Induced Amorphization in Nanoscale TiO 2 journal April 2006
Shock-Induced Localized Amorphization in Boron Carbide journal March 2003
Recent Advances in Dynamic Indentation Fracture, Impact Damage and Fragmentation of Ceramics journal September 2008
Plasticity and fracture of sapphire at room temperature: Load-controlled microcompression of four different orientations journal January 2014
Smaller is tougher journal March 2011
Scale effects for strength, ductility, and toughness in “brittle” materials journal March 2009
Reverse plasticity in single crystal silicon nanospheres journal December 2005
Brittle-to-Ductile Transition in Uniaxial Compression of Silicon Pillars at Room Temperature journal August 2009
Analysis of dislocation nucleation from a crystal surface based on the Peierls–Nabarro dislocation model journal August 2003
Fracture modes in micropillar compression of brittle crystals journal September 2011
Ductile–brittle transition in micropillar compression of GaAs at room temperature journal March 2011
Molecular Dynamics Study of Silica−Alumina Interfaces journal January 1996
Modeling of hydrophilic wafer bonding by molecular dynamics simulations journal June 2001
Concurrent in situ ion irradiation transmission electron microscope journal November 2014
Initial stages of contact-induced plasticity in sapphire. I. Surface traces of slip and twinning journal November 2007
Initial stages of contact-induced plasticity in sapphire. II. Mechanisms of plasticity initiation journal November 2007
Surface deformation of sapphire crystal journal July 1996
A continuum description of nonlinear elasticity, slip and twinning, with application to sapphire journal October 2008

Cited By (1)

Powder aerosol deposition method — novel applications in the field of sensing and energy technology journal September 2019