Mechanical Properties of LaB6-ZrB2 Composites

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The polycrystallined LaB6-ZrB2 composites with different content of ZrB2 were fabricated by vacuum hot-pressed sintering technique in this paper. The effects of ZrB2 content on the microstructure and mechanical properties were investigated. For the eutectic LaB6-ZrB2 (21wt%) composite, the hardness, flexural strength and fracture toughness is of 93.0 (HRA), 330.0MPa and 3.70MPa·m1/2, respectively. The results showed the hardness and flexural strength of LaB6-ZrB2 polycrystalline have been enhanced with the increasing of ZrB2 content, but the fracture toughness increases first then arrives at peak value, which is corresponding to the ZrB2 content of 21wt%. The microstructure observation revealed an improved densification due to addition of ZrB2. The fracture morphology showed a tendency of the fracturing from intergranular to transgranular manner with increasing the ZrB2 content. The fracture behavior of the composites was analyzed in the paper

Info:

Periodical:

Key Engineering Materials (Volumes 297-300)

Edited by:

Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim

Pages:

1630-1638

DOI:

10.4028/www.scientific.net/KEM.297-300.1630

Citation:

G. H. Min et al., "Mechanical Properties of LaB6-ZrB2 Composites ", Key Engineering Materials, Vols. 297-300, pp. 1630-1638, 2005

Online since:

November 2005

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Price:

$35.00

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