|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Microstructural and Chemical Analysis of Gas Atomized and Heat Treated Aluminum Alloy Powders
||Benjamin Bedard, Alexis Ernst, Tyler Flanagan, Sumit Suresh, Avinash M. Dongare, Seok-Woo Lee, Harold D. Brody, Aaron Nardi, Victor R. Champagne, Mark Aindow
|On-Site Speaker (Planned)
In the Cold Spray process, powders are deposited using a super-sonic gas stream at relatively low temperatures. Above a material-dependent critical velocity, the powder particles bond to the substrate surface forming a dense coating. The bonding involves shear band formation and “pancaking” of grains at the splat/substrate interface, but the microstructure away from the interface is similar to that in the initial powder particle. These powder microstructures are, however, often rather different from the bulk alloy. Here we consider the microstructures exhibited by gas-atomized Al6061 powders before and after heat-treatment. A combination of electron microscopy techniques is used to reveal both the way in which the main alloying elements (Mg and Si) and impurities (mainly Fe) are distributed in the powder, and the nature of the surface oxide layer. The consequences of these observations for the properties of the powders and of cold spray deposits produced from them is discussed.
||Planned: Supplemental Proceedings volume