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Static and cyclic creep behavior of in situTiB2 particulate reinforced aluminum composite

Published online by Cambridge University Press:  31 January 2011

Z. Y. Ma ,
S. C. Tjong  and
S. X. Li
Z. Y. Ma
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
S. C. Tjong*
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
S. X. Li
Affiliation:
State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Static and cyclic creep tests of Al–15 vol% TiB2in situ composite were carried out at 573–623 K. The values of apparent stress exponent and activation energy for cyclic creep of the composite were much higher than that for static creep. Furthermore, the cyclic creep rate tended to decrease with increasing percentage of unloading amount but was independent of the loading frequencies under the frequency ranges investigated. Finally, the true stress exponent of the composite was equal to 8, and the true activation energy was close to the value for the lattice self-diffusion of aluminum by incorporating a threshold stress for the analysis.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4541 - 4550
Copyright
Copyright © Materials Research Society 1999

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