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Compression behavior of magnesium/carbon nanotube composites

Published online by Cambridge University Press:  28 June 2013

Qizhen Li  and
Bing Tian
Qizhen Li*
Affiliation:
Chemical and Materials Engineering Department, University of Nevada, Reno, Reno, Nevada 89557
Bing Tian
Affiliation:
Chemical and Materials Engineering Department, University of Nevada, Reno, Reno, Nevada 89557
*
a)Address all correspondence to this author. e-mail: qizhenl@unr.edu
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Abstract

Carbon nanotube (CNT)-reinforced magnesium (Mg) matrix composites were synthesized using a powder metallurgical method and tested compressively along the plane normal and in-plane orientations. Yield strengths of composites were significantly increased by 35–129% compared with that of pure Mg. With the increase of CNT weight percentage, yield strength first increased until reaching a critical CNT weight percentage and then decreased. Twinning operated in the in-plane samples when CNT weight percentage was less than or equal to 0.5%, whereas twinning operation was not observed in all plane normal samples and the in-plane samples with 1% or higher CNT weight percentage. Severe plastic deformation was exhibited in fracture surface images with low magnification, whereas intrinsic brittle fracture feature was observed under high magnification. A theoretical model incorporating the Orowan strengthening and the thermal expansion mismatch strengthening was utilized and made good yield strength predictions.

Keywords

Mgcarbon nanotubecompositepowder metallurgymechanical behavior
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 28 , Issue 14 , 28 July 2013 , pp. 1877 - 1884
Copyright
Copyright © Materials Research Society 2013 

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Footnotes

This paper has been selected as an Invited Feature Paper.

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