Microstructure and Fracture Behavior of the Joint of Solidified TiB₂ Ceramic with Ti-6Al-4V Achieved by Reaction Fusion Bonding in Ultrahigh-Gravity Field

Abstract:

Based on taking combustion synthesis in ultrahigh-gravity field to prepare solidified TiC-TiB₂ ceramic, laminated composite of TiC-TiB₂ to Ti-6Al-4V was successfully obtained by fusion bonding, and within the joint there achieved multi-scale (micron-submicron-micro-nano) and multi-level (TiC_1-x-TiB-TiB₂ + TiB₂-Ti-TiC_1-x-TiB + TiB₂-TiC_1-x-TiB-Ti + TiB-TiC_1-x-Ti + TiC_1-x-Ti + Ti) composite structures characterized by size and distribution of TiB₂ and TiB phases. As micro-nano TiB₂, TiB platelets and needle-like nano TiB grains at the joint area initiated residual stress toughening and pinning at crack tip, while Ti phases initiated ductile phase toughening and subsequent bridging in crack-tip wake, a typical delayed fracture under external stress was manifested obviously in the joint of TiC-TiB₂ to Ti-6Al-4V. As a result, the shear fracture of the joint of ceramic toTi-6Al-4V alloy usually occurred in solidified area of Ti alloy rather than the joint, and the shear strength between the ceramic and Ti alloy was maintained at 375 ± 55 MPa.

• Periodical: Key Engineering Materials (Volume 591)
• Pages: 90-94
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.591.90
• Online since: November 2013
• Authors: Hai Long Cui, Zhong Min Zhao, Long Zhang, Xue Gang Huang
• Keywords: Crack Propagation, Fracture Behavior, Fusion Bonding, Layered Composite

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