Hybrid Al + Al3Ni metallic foams synthesizedin situvia laser engineered net shaping
| Autor: | Enrique J. Lavernia, Ying Li, Baolong Zheng, Dean Baker, John E. Smugeresky, Yizhang Zhou |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Philosophical Magazine. 91:3473-3497 |
| ISSN: | 1478-6443 1478-6435 |
| DOI: | 10.1080/14786435.2011.586375 |
| Popis: | A hybrid, Al + Al3Ni metallic foam was synthesized in situ via laser engineered net shaping (LENS®) of Ni-coated 6061 Al powder in the absence of a foaming agent. During LENS® processing, the Ni coating reacted with the Al matrix, resulting in the simultaneous formation of a fine dispersion of Al3Ni, and a high volume fraction of porosity. As a reinforcement phase, the intermetallic compound formed particles with a size range of 1–5 µm and a volume fraction of 63%, with accompanying 35–300 µm pores with a 60% volume fraction. The microstructure of the as-deposited Al + Al3Ni composite foams was characterized using SEM, EDS, XRD and TEM/HRTEM techniques. The evolution of the microstructure was analyzed on the basis of the thermal field present during deposition, paying particular attention to the thermodynamics of the Al3Ni intermetallic compound formation as well as discussing the mechanisms that may be responsible for the observed porosity. The mechanical behavior of the as-deposited material was charact... |
| Databáze: | OpenAIRE |
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