Surface oxide and hydroxide effects on aluminum microparticle impact bonding

Lienhard, Jasper; Crook, Cameron; Azar, Maryam Zahiri; Hassani, Mostafa; Mumm, Daniel R.; Veysset, David; Apelian, Diran; Nelson, Keith A.; Champagne, Victor K.; Nardi, Aaron; Schuh, Christopher A.; Valdevit, Lorenzo

doi:10.1016/j.actamat.2020.07.011

Cited by 43 publications

(11 citation statements)

References 39 publications

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“…Nevertheless, the thickness of the native oxide layer can significantly affect the critical bonding velocity. Lienhard et al (189) exposed Al powder particles to 300 °C for up to 240 min in dry air, or to room-temperature with humidity levels as high as 50% for 4 days and consequently conducted LIPIT experiments. No significant differences were found in terms of the critical bonding velocity which were attributed to the similar characteristics of the passivation layer (thickness, uniformity, crystallinity and composition) in different powder batches.…”

Section: Figure 16bmentioning

confidence: 99%

High-velocity micro-projectile impact testing

Veysset

Lee

Hassani

et al. 2021

Applied Physics Reviews

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High-velocity microparticle impacts are relevant to many fields from space exploration to additive manufacturing and can be used to help understand the physical and chemical behaviors of materials under extreme dynamic conditions. Recent advances in experimental techniques for single microparticle impacts have allowed fundamental investigations of dynamical responses of wide-ranging samples including soft materials, nano-composites, and metals, under strain rates up to 10 8 s -1 . Here we review experimental methods for high-velocity impacts spanning 15 orders of magnitude in projectile mass and compare method performances. Next, we present a review of recent studies using the laser-induced particle impact test technique comprising target, projectile, and synergistic target-particle impact response. We conclude by presenting the future perspectives in the field of high-velocity impact. FIG. 1. Impact testing techniques and applications, along with lines of constant characteristic strain rates. All-capital labels are associated with shaded regions of the same color.

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Section: Figure 16bmentioning

confidence: 99%

High-velocity micro-projectile impact testing

Veysset

Lee

Hassani

et al. 2021

Applied Physics Reviews

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“…Due to the presence of said volatiles and impurities within a given gas-atomized powder, secondary processing of the particulates as feedstock material will have detrimental effects if the gaseous species are not removed prior to consumption during powder-fed manufacturing. The negative consequences associated with powder fed manufacturing using as-atomized powder can include cracking, blistering, and insufficient component density [81]. With respect to cold spray in particular, surface oxides and hydroxides have been shown to raise the critical velocity of an aluminum microparticle by 14% in [82].…”

Section: Degassing and Additional Processing Effectsmentioning

confidence: 99%

Nanomechanical Characterization for Cold Spray: From Feedstock to Consolidated Material Properties

Sousa

Gleason

Haddad

et al. 2020

Metals

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Cold gas-dynamic spray is a solid-state materials consolidation technology that has experienced successful adoption within the coatings, remanufacturing and repair sectors of the advanced manufacturing community. As of late, cold spray has also emerged as a high deposition rate metal additive manufacturing method for structural and nonstructural applications. As cold spray enjoys wider recognition and adoption, the demand for versatile, high-throughput and significant methods of particulate feedstock as well consolidated materials characterization has also become more notable. In order to address the interest for such an instrument, nanoindentation is presented herein as a viable means of achieving the desired mechanical characterization abilities. In this work, conventionally static nanoindentation testing using both Berkovich and spherical indenter tips, as well as nanoindentation using the continuous stiffness measurement mode of testing, will be applied to a range of powder-based feedstocks and cold sprayed materials.

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“…The oxidation is, besides the chemical composition of the alloy, strongly influenced by the temperature and humidity in the surrounding atmosphere [ 42 ]. Even ambient-temperature exposures of passivated aluminium to increased relative humidity levels are correlated with unique changes in the passivation layer’s thickness, the thickness uniformity, the crystallinity, and the chemical composition [ 46 ]. Similar effects have been reported for the adhesion of unburnt fuel to the piston of a diesel engine made of an Al–Si–Cu alloy [ 36 ].…”

Section: Discussionmentioning

confidence: 99%

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

Petrovič

Mandrino

2021

Materials

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The surface stoichiometry of the degraded surface of a commercial Al–Si casting was investigated. The die-cast component was previously stored in a sealed plastic envelope. After that, surface stains in the form of white layers were observed. X-ray photoelectron spectroscopy (XPS) was used to study these layers. For comparison, a seemingly unaffected area as well as a freshly cut surface of the casting were also analysed. In order to additionally assess the surface condition, surface roughnesses were measured. Based on the binding energies (BEs) of the Al and O in the XPS spectra, and the stoichiometric results, it was concluded that the surface layers of the degraded and undegraded samples consist mostly of aluminium oxide and aluminium hydroxide. Furthermore, sodium phosphate from the leftover detergent and silicon oxide were detected in both analysed areas. Analyses of the Al KLL Auger transition were used to corroborate this. The relative shares of Al oxide vs. hydroxide based on the elemental concentrations were determined. The chemical compositions and chemical states of the elements in the top layers were thus obtained. The combination of surface-sensitive analytical techniques was found to be a suitable tool for the ex-post identification of the source of defects.

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Surface oxide and hydroxide effects on aluminum microparticle impact bonding

Cited by 43 publications

References 39 publications

High-velocity micro-projectile impact testing

High-velocity micro-projectile impact testing

Nanomechanical Characterization for Cold Spray: From Feedstock to Consolidated Material Properties

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

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