Experimental and first-principles study on TiB/TiC interface in hybrid (TiB+TiC)/Ti6Al4V composite. Issue 15 (1st August 2022)

• Record Type: Journal Article
• Authors: An, Qi; Wang, Shuai; Huang, Lujun; Wang, Cunyu; Qian, Qi; Jiang, Yong; Wang, Liqin; Geng, Lin
• Is Part Of: Ceramics international. Volume 48:Issue 15(2022)
• Page Start: 22595
• Page End: 22600
• Publication Date: 2022-08-01
• Subjects: TiB-TiC intergrowth Structure -- Interfacial characters -- Ab-initio calculations -- Load-bearing capacity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.04.249
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To understand the synergistic strengthening mechanism of hybrid TiB + TiC reinforcements in Ti matrix composites, the corresponding TiB/TiC interfacial characters and load-bearing capacity were revealed in this work through a coupled method of high-resolution transmission electron microscopy (HRTEM), ab-initio calculations, and Vickers indentation test. Results show the interfacial orientation relationship (OR) between TiB and TiC phases is [010]TiB //[11 2 ‾ ]TiC, (2 2 ‾ 0)TiC //(102)TiB, which exhibits an interface formation energy of 3.32 J/m 2 estimated via first-principles calculations. The TiB/TiC interface shows a high adhesion strength of 5.78 J/m 2 owing to the formation of strong B–C covalent bond, which is also slightly higher than the strength (5.52 J/m 2 ) obtained within TiB. Moreover, the strong TiB/TiC interface contributes to the superior load-bearing capacity of the intergrowth ceramic structure with relatively higher hardness (∼2100 HV0.2 ) than that of individual TiB and TiC phases (around 2020–2030 HV0.2 ). Consequently, the hybrid TiB + TiC reinforcements exhibit a synergistic strengthening effect in Ti matrix composites due to the intergrowth microstructure characteristic with superior load-bearing capacity.