Nanostructured diamond-TiC composites with high fracture toughness

Autor:	Chuanmin Meng, Wenjun Zhu, Haikuo Wang, Mingjun Tang, Haini Dong, Chao Xu, Yu Li, Duanwei He, Zhigang Wang
Rok vydání:	2013
Předmět:	Toughness Materials science Fracture toughness Brittleness Material properties of diamond engineering General Physics and Astronomy Diamond Composite material engineering.material High-resolution transmission electron microscopy Nanocrystalline material Amorphous solid
Zdroj:	Journal of Applied Physics. 113:043505
ISSN:	1089-7550 0021-8979
Popis:	We report the preparation of nanostructured diamond-TiC composites with high fracture toughness and high hardness starting from a ball-milled mixture of nano-sized Ti3SiC2 and submicron-sized diamond by simultaneously tuning the pressure-temperature conditions. The phase segregation of Ti3SiC2 at pressure of 5.5 GPa were investigated by X-ray diffraction and high resolution transmission electron microscopy, we found that the Ti3SiC2 could decompose into nanosized TiC and amorphous Ti-Si at 600–700 °C. The subsequent reaction between diamond and Ti-Si led to an amorphous Ti-Si-C matrix in which diamond and TiC crystals are embedded. With a loading force of 98 N, the measured fracture toughness KIC and Vicker's hardness HV of the synthesized composites reach up to 14 MPa m1/2 and 45.5 GPa, respectively. Our results demonstrate that the nanocrystalline/amorphous bonding matrix could largely enhance the toughness of the brittle composites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2be7a016bb724831337efb5ae5b11b9c https://doi.org/10.1063/1.4789004 Zobrazit plný text záznamu