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Impact of particle strength and matrix ductility on the deformation mechanism of metallic syntactic foam
Ist Teil von
Journal of alloys and compounds, 2019-05, Vol.786, p.292-299
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
This paper presents a systematic study on the interaction between particle strength, matrix ductility and the deformation mechanism in metallic syntactic foam (MSF). Packed beds of near-spherical NaCl particles (ø2-2.8 mm) were infiltrated with liquid metal to produce the required samples. The brittle zinc alloy ZA-27 and ductile Aluminium (99% Al) were used as matrix materials. NaCl particles were retained inside half of these samples to replicate MSF containing high-strength particles. NaCl was leached from the remaining samples to investigate MSF with weak particles. This procedure ensured that all samples had a near-identical matrix geometry and microstructure, thus isolating the effect of particle strength. Quasi-static compression tests were conducted and significant changes in the deformation behaviour were observed. Samples containing NaCl particles deformed in a shear-band dominated mode, whilst the ductile foam underwent layer-by-layer deformation.
•The paper presents a systematic study of metallic syntactic foams.•Syntactic foam particles strongly affect the initial foam strength.•Foams with weak particles are susceptible to density gradients.•Brittle matrices or strong particles increase the likelihood of shear fracture.