| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
|
| Presentation Title |
Deformation Mechanisms in Laser Processed Nano-eutectics |
| Author(s) |
Amit Misra, Jian Wang |
| On-Site Speaker (Planned) |
Amit Misra |
| Abstract Scope |
Al-Al2Cu and Al-Si cast eutectic alloys were refined to nanoscale by laser surface remelting producing nano-lamellar and nano-fibrous morphologies, respectively. Both heterostructures comprising of relatively soft (Al) and hard (Al2Cu or Si) phases exhibited ultra-high strength and strain hardening. Deformation mechanisms are characterized using in situ straining in electron microscopy and atomistic modeling. In both alloys, plastic flow homogeneity increased with increasing heterogeneity of the nanoscale microstructures, but due to different mechanisms. The nano-lamellar morphology exhibited unusual shear modes in the hard Al2Cu phase due to interface crystallography and defect energetics favored slip transmission. In Al-Si, there is no direct slip transmission across interfaces but the propagation of nano-cracks is suppressed by surrounding Al that exhibits high strain hardening, retaining good tensile ductility of the sample. The role of the interfacial mechanisms, and microstructural length scales and morphology in enhancing plastic homogeneity in heterogeneous microstructures is discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Modeling and Simulation |