Forming and mechanical properties of "interlocking" layered titanium matrix composite materials based on DIW

Abstract

Bimaterial printing of 0.8%(volume fraction)BNNSs/TC4 ink and TC4 ink were carried out by direct ink writing (DIW) to build an inter-layered "interlocked" interface. Dense inter-layered "interlocked" laminated TC4-TiB/TC4 composites reinforced by TiB nanowires were obtained by combining DIW with fast hot pressed sintering (FHPS), and their mechanical properties were investigated. The results show that the inter-layered "interlocked" structure is successfully retained after sintering; the inter-layered "interlocked" laminated TC4-TiB/TC4 composites prepared by DIW have an improved strength (by 9.1% to 1206 MPa) while preserving the high toughness compare to the unconfigured 0.4%TiB/TC4 composites with uniform distribution of the reinforcement. The analysis shows that the inter-layered "interlocked" interface deflects the cracks significantly, hinders the crack expansion, and improves the overall material toughness, which provides ideas for forming complex and tough composite components.

Keywords

• laminated titanium matrix composites
• direct ink writing
• multi-material printing
• inhomogeneous distribution
• interlocking structure