Fracture behavior of HPHT synthetic diamond with micrometers metallic inclusions

doi:10.1007/s11706-009-0020-5

Front Mater Sci Chin

2009, Vol. 3

Issue (2) : 218-223 https://doi.org/10.1007/s11706-009-0020-5

RESEARCH ARTICLE

Fracture behavior of HPHT synthetic diamond with micrometers metallic inclusions

He-sheng LI^1,2, Yong-xin QI^1,2, Yuan-pei ZHANG^1,2, Mu-sen LI^1,2(

)

1. Key Laboratory of Liquid Structure and Heredity of Materials (Ministry of Education), Shandong University, Jinan 250061, China; 2. Shandong Engineering Research Center for Superhard Materials, Zoucheng 273500, China

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Abstract

The fracture behavior of the diamond single crystals with metallic inclusions was investigated in the present paper. Single diamond crystals with metallic inclusions were formed by a special process with high pressure and high temperature (HPHT). The inclusions trapped in the diamond were characterized mainly to be metallic carbide of (Fe,Ni)₂₃C₆ or Fe₃C and solid solution of γ-(Fe,Ni) by transmission electronic microscopy (TEM). The grain size of the inclusions is about micrometers. The fracture characteristics of the diamond single crystals, after compression and heating, were investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The fracture sections of the compressed and heated diamonds were found to be parallel to the (111) plane. The interface of the inclusions and diamond is deduced to be the key factor and the original region of the fracture formation. Mechanisms of the fracture behavior of the HPHT synthesized diamonds are discussed.

Keywords synthetic diamond metallic inclusions fracture microstructure

Corresponding Author(s): LI Mu-sen,Email:msli@sdu.edu.cn

Issue Date: 05 June 2009

Cite this article:

He-sheng LI,Yong-xin QI,Yuan-pei ZHANG, et al. Fracture behavior of HPHT synthetic diamond with micrometers metallic inclusions[J]. Front Mater Sci Chin, 2009, 3(2): 218-223.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-009-0020-5
https://academic.hep.com.cn/foms/EN/Y2009/V3/I2/218

Fig.1 Photograph of diamond single crystals containing many large-size inclusions

Fig.2 TEM image of FeC particle in the diamond crystal; The corresponding SAD pattern from the [101] zone axis of FeC

Fig.3 TEM image of γ-(Fe,Ni) particles in the diamond crystal; The corresponding SAD pattern from the [211] zone axis of γ-(Fe,Ni)

Fig.4 TEM image of (Fe,Ni)C particles in the diamond crystal; The corresponding SAD pattern from the [211] zone axis of (Fe,Ni)C

Fig.5 Photographs of chapped diamond crystals after pressing and oxidization at 1000oC for 10 min

Fig.6 SEM images of the fracture section of the compressed diamond crystal after being shattered by supersonic wave ((b) is the local magnification of (a))

Fig.7 SEM image of the fracture section of heated diamond crystal after being shattered by supersonic wave

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