Abstract
Abstract Infiltrated molten Al matrix by mechanical-pressure infiltration method into the ceramic scaffold prepared by freeze-drying technology could prepare dense lamellar Al matrix composites without damage of the biomimetic microstructure of the scaffold. However, the investigation of lamellar Al matrix composites prepared by freeze-drying and mechanical-pressure infiltration method has not been fully understood yet. In the present work, the Al2O3 scaffold with pearl layer structure was prepared by freezing-dry method, and eventually the lamellar Al2O3p/Al composite was fabricated by mechanical-pressure infiltration method. The Al matrix was infiltrated well into the large pores of the Al2O3 scaffold, and the lamellar structure of the Al2O3 was well preserved. The hardness of the lamellar Al2O3p/Al composite was isotropic in transvers and perpendicular directions. However, the compressive strengths of the lamellar Al2O3p/Al composite were significant anisotropic while the compressive strength in transvers direction was 127.7% higher than that in the perpendicular direction, indicating the integrality of the lamellae microstructure (especially the bridging layers). Due to the mismatched deformability, weak debonding was observed between Al and Al2O3p/Al layers in the fracture surface of the lamellar Al2O3p/Al composite. It indicates that the interfacial bonding between Al and Al2O3p/Al layers is rather strong, which is beneficial for higher strength in transvers direction but lead to lower strength in perpendicular direction.
Highlights
Al matrix composites reinforced with homogeneous distributed particles have been widely investigated due to their high specific stiffness [1], strength [2] and tailorable thermal-physical properties [3]
It indicates that the interfacial bonding between Al and Al2O3p/Al layers is rather strong, which is beneficial for higher strength in transvers direction but lead to lower strength in perpendicular direction
The lamellar Al2O3p/Al composite demonstrated significant layered-like fracture behavior
Summary
Al matrix composites reinforced with homogeneous distributed particles have been widely investigated due to their high specific stiffness [1], strength [2] and tailorable thermal-physical properties [3]. The strength enhancement in homogeneous composites is usually achieved at the expense of plasticity [4]. It has been found that inhomogeneous composites demonstrate good compatibility in strength and plasticity compared with the homogeneous distributed reinforcements [5]. More attention in the past decades has been paid on the design, preparation and characterization of the inhomogeneous distributed microstructure in the composites. Lamellar Al matrix composites, whose microstructure is bio-inspired by the nacre, have been considered as candidates for light-weight armor protection materials due to their high strength and toughness. Recently, the lamellar Al matrix composites have been extensively
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