Abstract
A novel bio-inspired metal hollow sphere filled TC4/Al sandwich composite was proposed based on the cognition of biological materials with TC4/Al metal laminated composites (MLCs) as outer layers and metal hollow sphere composite (MHSC) made from 316 L stainless steel (316 L SS) metal hollow spheres (MHSs) and Al powder matrix as inner core. The sandwich composite was sintered by the hot pressing method in a one-step process. Scanning electron microscopy (SEM) observation, energy dispersive spectrometer analysis (EDS), and X-ray diffraction (XRD) analysis were carried for characterization on multiple interfaces. Al3Ti intermetallic compound layers were formed between laminations and 316 L/Al interfaces with Fe-Al intermetallic compounds were formed between 316 L SS MHSs and Al matrix in MHSC inner core. Compressive stress-strain curves of the sandwich composite exhibited the combination characteristic of the comparison MHSC and MLC curves. The deformation behavior of the sandwich composite was first dominated by MHSC inner core and then by MLCs outer layers. Failure modes and interface effects were also studied.
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