Creep in alumina and carbon nanotube reinforced alumina composites

Gopalan, Hariprasad and Chokshi, Atul H (2018) Creep in alumina and carbon nanotube reinforced alumina composites. In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 731 . pp. 561-568.

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Abstract

Despite numerous studies over five decades, the mechanism controlling creep in fine grained alumina has not yet been identified unambiguously. Compression creep experiments in alumina and carbon nanotubes (CNTs) re-inforced alumina composites reveal that the creep at high stresses is not influenced by the presence of CNTs at grain boundaries. All data at high stresses are consistent with a Coble diffusion creep mechanism and a stress exponent of one, and an interface controlled diffusion creep process at lower stresses with a stress exponent greater than one. This is similar to earlier observations in fine grained yttria stabilized tetragonal zirconia. Based on a recent study on Al tracer grain boundary diffusion, analysis of the data in terms of cation and anion diffusion along grain boundaries suggests that creep is controlled by the slower O diffusion along grain boundaries.

Item Type:	Journal Article
Publication:	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copy right for this article belong to ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Alumina; Carbon nanotubes; Composite; Creep; Diffusion
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	12 Sep 2018 15:17
Last Modified:	25 Aug 2022 04:36
URI:	https://eprints.iisc.ac.in/id/eprint/60665

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