AI Article Synopsis
- Zinc alloy (ZA27) syntactic foams were created using expanded perlite and a counter-gravity infiltration casting method, resulting in varying densities between 1.78 to 2.03 g·cm.
- Heat treatment of the foam samples transformed the alloy's microstructure from a multiphase dendrite to a spheroidized structure, leading to increased ductility and enhanced compressive properties.
- Testing revealed that the as-cast foams primarily failed through brittle fracture, while heat-treated foams demonstrated a ductile deformation mechanism under compression.
Article Abstract
Zinc alloy (ZA27) syntactic foams (SF) were manufactured using expanded perlite (EP) particles and counter-gravity infiltration casting. Due to a variation of the metallic matrix content, the density of the produced foam samples varied from 1.78 to 2.03 g·cm. As-cast and solution heat-treated samples were tested to investigate the compressive properties of the ZA27 syntactic foam. To this end, quasi-static compression tests were conducted. In addition, microstructural analysis of the as-cast and heat-treated syntactic foams was carried out using scanning electron microscopy. The results indicate that the heat treatment alters the microstructure of the ZA27 alloy matrix from a multiphase dendrite to a spheroidized microstructure with improved ductility. Moreover, the heat treatment considerably enhances the energy absorption and plateau stress ( σ pl ) of the syntactic foam. Optical analysis of the syntactic foams under compression shows that the dominant deformation mechanism of the as-cast foams is brittle fracture. In comparison, the heat-treated samples undergo a more ductile deformation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427441 | PMC |
| http://dx.doi.org/10.3390/ma12050792 | DOI Listing |
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