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Mechanical Properties and Microstructure of Boron Carbide-Cerium Boride Composite

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Abstract:

The mechanical properties of B4C-CeB6 composite prepared by hot pressed sintering method were tested. The study shows: the hardness of B4C-CeB6 composite increases with the content of cerium boride. When the content of the cerium boride is 4wt%, the hardness reaches its supreme value of 31.98Gpa，its hardness is improved nearly 21.09% compared to monolithic boron carbide. The content of the cerium boride does not affect greatly on flexibility strength. However，it gives much effect on fracture toughness. When the content of the cerium boride is 4wt%, the fracture toughness reaches its supreme value of 5.06MPa.m1/2, which is improved nearly 37.5% compared to monolithic boron carbide materials. The main fracture way of B4C-CeB6 composite is intercrystalline rupture, while the transcrystalline rupture is minor. It appears that this change of fracture mode gives rise to the improvement of the fracture toughness.

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Periodical:

Advanced Materials Research (Volumes 482-484)

Pages:

1551-1555

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.482-484.1551

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Online since:

February 2012

Authors:

Ke Wu Peng, Nian Wen Pu, He Li Ma, Ren Chen, Yan Wang

Keywords:

Boron Carbide, Cerium Boride, Mechanical Property, Microstructure

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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