About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
High Velocity Microparticle Impacts of Heat-Treated Al 6061 |
Author(s) |
Hyein Na, Christopher Allan Schuh |
On-Site Speaker (Planned) |
Hyein Na |
Abstract Scope |
Cold spray is a rapidly advancing technology for coating and additive manufacturing, yet the role that powder microstructure and properties play in processing by this method remains unclear. While the connections between pre-heat treatment variables and coating properties have been explored, there is still a knowledge gap regarding how microstructure affects the bonding between the individual particles and the substrate. Using a laser-induced particle impact test (LIPIT), we present a precise quantitative analysis to investigate the effect of different heat treatment conditions on the critical adhesion velocity of Al 6061. We demonstrate that the critical velocity remains nearly constant due to two competing factors, the dynamic yield strength and the native oxide layer; these two factors change in somewhat complementary ways during heat treatment. By understanding the two factors, directions for new heat treatment regimens that might lower the adhesion velocity are suggested. |