|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Metal-Matrix Composites: Advances in Processing, Characterization, Performance and Analysis
||Micro-scale In-situ Mechanical Testing and Nano-CT Characterization of Directed Energy Deposited Hybrid Al/Al3Ni Composite Foam Materials
||Baolong Zheng, Xin Wang, Dongxu Liu, Lizhi Sun, Enrique J. Lavernia, Julie M. Schoenung
|On-Site Speaker (Planned)
A hybrid Al+Al3Ni composite foam was synthesized in situ via directed energy deposition (DED) of Ni-coated Al6061 powder, in the absence of a foaming agent. During DED processing, the Ni coating reacted with the Al matrix, resulting in the simultaneous formation of a fine dispersion of Al3Ni intermetallic compounds, and a high-volume fraction of pores. The microstructure evolution was characterized with electron microscopy (SEM, TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). The distribution and fraction of pores and Al3Ni phases in as-deposited foams were identified with X-ray computed tomography (XCT). We also used focused ion beam to prepare micron-sized pillars containing pores and Al3Ni intermetallic phases in the Al matrix, and evaluated the mechanical behavior in micro-compression. The deformation behavior of the pores, Al3Ni and the Al matrix was observed and was used to interpret the balance of enhanced strength and ductility of this hybrid Al+Al3Ni metallic foam.
||Composites, Additive Manufacturing, Mechanical Properties