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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Strength properties and fracture behavior of
ZrC particle-reinforced tungsten composite
WANG Yu-jin(王玉金), SONG Gui-ming(宋桂明),
MENG Qing-chang(孟庆昌), ZHOU Yu(周  玉)

School of Materials Science and Engineering,
Harbin Instituteof Technology, Harbin 150001, P.R.China

Abstract: The flexural strength of 30% (volume fraction) ZrC particlereinforced tungsten composite (ZrCp/W) at 20~1200℃ were measured using three-point bending, and the fracture behaviors of the samples at 20℃ and 1000℃ were studied with a scanning electron microscope. As temperature increases, the strength of the composite increases firstly and the highest strength value, 829MPa, is measured at 1000℃,and then the strength decreases when temperature is over 1000℃.The fracture of the composite at 20℃,which is controlled by the crack initiating process, is brittle, and the corresponding stressdeflection curve is linear. There is a metastable growth and coalescence of the initial cracks during the fracture process of the samples at 1000℃,and the stressdeflection curve displays a nonlinear characteristic. The good elevated strength of the composite is partly attributed to the W grain interior strength and ZrCp/W interface strength. The reinforcement at high temperature is mainly attributed to the load transfer of ZrCp/W interface and dislocation strengthening.

 

Key words:  tungsten composite; zirconium carbide; strength; fracture behavior

ISSN 1672-7029
CN 43-1423/U

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