Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

Hassani-Gangaraj, Mostafa; Veysset, David; Champagne, Victor K.; Nelson, Keith A.; Schuh, Christopher A.

doi:10.1016/j.scriptamat.2018.12.015

Cited by 68 publications

(25 citation statements)

References 30 publications

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“…Such parameters have yet to be considered in the context of high-throughput assessment of powder for cold spray applications. In light of recent refinements underpinning our collective understanding of the mechanism associated with particle/substrate bonding [119][120][121], and the material properties associated with a shock-wave mediated critical velocity relation instead of an adiabatic shear instability approach, we hypothesize that the use of these two nanoindentation derived parameters could assist with pre-deposition particulate feedstock analysis and suitability evaluation for cold spray processing.…”

Section: Rapid Prototyping and Assessment Of Powdermentioning

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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Section: Rapid Prototyping and Assessment Of Powdermentioning

confidence: 99%

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

Sousa

Gleason

Haddad

et al. 2020

Metals

Self Cite

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“…Assadi et al published a controversial paper commenting on this study. 99) A response to this paper was published by Hassani-Gangaraj 100) in the same journal, Scripta Materialia, and debate on this issue is ongoing.…”

Section: Shear Instability and Shock Wave Modelmentioning

confidence: 99%

Current Status and Challenges for Unified Understanding of Bonding Mechanism in Solid Particle Deposition Process

Ichikawa

Shinoda

2021

Mater. Trans.

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Cold spray (CS) technology is a "solid-phase particle deposition process without melting"; however, it has been established as an additive manufacturing technology that can be applied beyond the framework of one field of thermal spraying. The scope of application of this technology has expanded to include ceramics and polymers. There are other solid particle deposition processes besides CS, such as aerosol deposition (AD), which differ in the material type, size, impact speed, and temperature of the target particles. We can expect that there is a common intrinsic mechanism through which solid-phase particles are joined and deposited in the solid phase. This review summarizes previous studies on the mechanism of cold-spray deposition and bonding, which can be understood as a mechanochemical phenomenon in part, and it is driven by the deformation of the particles and the resulting change in the chemical state of the particle surface, and stabilization by contact in a short time. When we understand these issues correctly, the optimal mechanical conditions (material size and collision conditions) for joining particles of various materials will be systematically understood, and it will be possible to perform different fabrication processes from thin films to additive manufacturing without melting various materials.

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“…For the second simulation setting in the NVE ensemble also for dynamic layer, an MD simulation was performed that removes the heat coupling and processes the whole system as thermally isolated. The particle spray velocity ranges from 500 m/s to 1500 m/s in the perpendicular direction to the substrate surface to preserve adhesion and prevent erosive wear behaviour [57][58][59]. The molecular dynamics simulation time for CGDS is 20 ps.…”

Section: Atomic Structure Evolution and Materials Jet Initiationmentioning

confidence: 99%

Molecular Dynamics Simulation of Dislocation Plasticity Mechanism of Nanoscale Ductile Materials in the Cold Gas Dynamic Spray Process

Oyinbo

Jen

2020

Coatings

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The dislocation plasticity of ductile materials in a dynamic process of cold gas spraying is a relatively new research topic. This paper offers an insight into the microstructure and dislocation mechanism of the coating using simulations of molecular dynamics (MD) because of the short MD simulation time scales. The nano-scale deposition of ductile materials onto a deformable copper substrate has been investigated in accordance with the material combination and impact velocities in the particle/substrate interfacial region. To examine the jetting mechanisms in a range of process parameters, rigorous analyses of the developments in pressure, temperature, dislocation plasticity, and microstructure are investigated. The pressure wave propagation’s critical function was identified by the molecular dynamics’ simulations in particle jet initiation, i.e., exterior material flow to the periphery of the particle and substrate interface. The initiation of jet occurs at the point of shock waves interact with the particle/substrate periphery and leads to localization of the metal softening in this region. In particular, our findings indicate that the initial particle velocity significantly influences the interactions between the material particles and the substrate surface, yielding various atomic strain and temperature distribution, processes of microstructure evolution, and the development of dislocation density in the particle/substrate interfacial zone for particles with various impact velocities. The dislocation density in the particle/substrate interface area is observed to grow much more quickly during the impact phase of Ni and Cu particles and the evolution of the microstructure for particles at varying initial impact velocities is very different.

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Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

Abstract: The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. CitationHassani-Gangaraj, Mostafa et al. 'Response to Comment on "Adiabatic shear instability is not necessary for adhesion in cold spray".'

Cited by 68 publications

References 30 publications

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

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

Current Status and Challenges for Unified Understanding of Bonding Mechanism in Solid Particle Deposition Process

Molecular Dynamics Simulation of Dislocation Plasticity Mechanism of Nanoscale Ductile Materials in the Cold Gas Dynamic Spray Process

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