| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Connecting Microstructure Evolution to Mechanical Behavior of an Al-Mn-Sc Alloy Designed for Selective Laser Melting |
| Author(s) |
Fan Zhang, Qingbo Jia, Xinhua Wu |
| On-Site Speaker (Planned) |
Fan Zhang |
| Abstract Scope |
Laser-based additive manufacturing features a nonequilibrium fabrication process. Its inherent variations in the directionality and magnitude of thermo-mechanical strain and temperature gradients lead to formation of heterogeneous microstructures and nonuniform mechanical properties. Understanding the connection between microstructure evolution and mechanical behaviors through post-build heat treatment is critical for alloy optimization. We performed comprehensive structure characterization using ex situ scanning/transmission electron microscopy, atom-probe tomography, and in situ synchrotron-based small angle X-ray scattering and X-ray diffraction to investigate the precipitation kinetics of an Al-Mn-Sc alloy specifically designed for selective laser melting. We observed simultaneous and continuous nucleation and growth of two types of precipitates at distinct length scales and evaluated their effects on mechanical properties acquired by tensile testing. We identified a pseudo-delay nucleation and growth phenomenon for the strengthening nanoscopic Al3Sc precipitates, attributable to intrinsic heat treatment induced by layer-by-layer fabrication of additive manufacturing.
[1] Acta Materialia, (193) 239-251, 2020. |
| Proceedings Inclusion? |
Planned: |