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Creep behavior of in situ dual-scale particles-TiB whisker and TiC particulate-reinforced titanium composites

Published online by Cambridge University Press:  31 January 2011

Z. Z. Ma ,
S. S. Tjong  and
X. X. Meng
Z. Z. Ma
Affiliation:
Department of Metallurgical Engineering, University of Missouri, Rolla, Missouri 65409
S. S. Tjong
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, Peoples Republic of China
X. X. Meng
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, Peoples Republic of China
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Abstract

A titanium composite reinforced by in situ dual-scale particle, high-aspect-ratio TiB whiskers and fine TiC particulates was fabricated by a reactive hot pressing technique from a B4C–Ti system. The composite was subjected to creep investigations in compression at 873–923 K. This composite exhibited a stress exponent of 4.5–4.6 and a creep activation energy of 298 kJ/mol. By comparison, unreinforced Ti exhibited a stress exponent of 5.2–5.3 and a creep activation energy of 259 kJ/mol. No change in the stress exponent with varying creep rates was observed in both composite and unreinforced Ti under the investigated creep rates. The creep resistance of the composite was more than one order of magnitude higher than that of the unreinforced Ti. The load transfer mechanism accounted for this result. The creep of both composite and unreinforced Ti was controlled by lattice diffusion in the titanium matrix.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 9 , September 2002 , pp. 2307 - 2313
Copyright
Copyright © Materials Research Society 2002

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