In-situ observations of single micro-particle impact bonding
Author(s)Hassani Gangaraj, Seyyed Mostafa; Veysset, David Georges; Nelson, Keith Adam; Schuh, Christopher A
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We study supersonic impact of individual metallic microparticles on metallic substrates, that is, the unit process of materials buildup in cold spray coatings/additive manufacturing. We resolve the moment of impact bonding through real-time observations of single particle impacts with micron-scale and nanosecond-level resolution. We offer the first in-situ observation of a material-dependent threshold velocity, above which the particle undergoes an impact-induced jet-like material ejection and adheres to the substrate. We report direct measurements of critical velocities for structural metals, which unlike in nozzle experiments, are not affected by process-related complexities obscuring particles' kinetic and thermal histories. Keyword: Cold spray; Adhesion; Additive manufacturing; Impact
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Hassani-Gangaraj, Mostafa et al. "In-situ observations of single micro-particle impact bonding." Scripta Materialia, 145 (March 2018): 9-13 © 2017 Acta Materialia Inc.
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