|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-64: Mechanical Characterization of Cold Sprayed Aluminum Alloy Powders Using In Situ Micropillar Compression and Tension
||Tyler Flanagan, Benjamin Bedard, Mark Aindow, Avinash Dongare, Harold Brody, Aaron Nardi, Victor Champagne, Seok-Woo Lee
|On-Site Speaker (Planned)
The cold spray process utilizes a high pressure gas jet to accelerate metallic microparticles to supersonic velocities. The mechanical characterization of the impacted microparticles on the substrate, which undergo severe plastic deformation, is of great interest as the unusual microstructure leads to unique deformation mechanisms, which relates to the mechanical properties of cold sprayed coating. Here, we present micropillar compression/tension results of cold-sprayed Al-6061 powders, which were fabricated under various heat-treatment conditions(as-atomized, air-aged, solutionized), with two different impact velocities of 0.75 and 1 km/s. We found significant shock-induced strengthening, but its magnitude is independent of impact velocity. Additionally, the fracture mode is strongly dependent on the initial microstructure. We discuss our results in terms of dislocation-based plasticity. Our study will give an insight in fundamental understanding on the effects of high strain rate deformation mechanisms during the cold spray process.
||Planned: Light Metals