| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Quantifying the Plastic Deformation Behavior of Grain Boundaries in Additive Manufactured Ta |
| Author(s) |
Nan Li, jordan Weaver, Yuchi Cui, David Jones, Nathan Mara, Saryu Fensin, Curt Bronkhorst, Amit Misra, Rusty Gray |
| On-Site Speaker (Planned) |
Nan Li |
| Abstract Scope |
The plastic deformation behavior of grain boundaries in additive manufactured Ta has been explored through micropillar compression and in situ TEM indentation experiments. In the micropillar compression tests, three high angle grain boundaries are chosen with varying crystal orientations. The main phenomenon of interest was slip transmission or strain transfer in the bi-crystals which was considered to occur when slip traces aligned across the grain boundary. These observations were compared against two slip transmission factors, m^'=cos(ψ)cos(κ)and A=LRB=cos(θ)cos(κ), where 𝜓, 𝜃 𝑎𝑛𝑑 𝜅 are the angles between the slip vectors, slip plane normal, and the intersection of the slip planes with the grain boundary from the slip systems on either side of the grain boundary. Slip transmission occurred for 𝑚′ ≥ 0.85 and did not occur for 𝑚′ ≤ 0.46. In addition, in situ indentation has been performed in the vicinity of grain boundary to probe correlated interaction behavior with dislocations. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |