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Bulk titanium–graphene nanocomposites fabricated by selective laser melting

Published online by Cambridge University Press:  12 March 2019

Zengrong Hu ,
Dini Wang ,
Changjun Chen ,
Xiaonan Wang ,
Xiaming Chen  and
Qiong Nian Open the ORCID record for Qiong Nian [Opens in a new window]
Zengrong Hu
Affiliation:
School of Rail Transportation, Soochow University, Suzhou, Jiangsu 215131, China
Dini Wang
Affiliation:
Department of Mechanical Engineering, Arizona State University, Tempe, Arizona 85281, USA
Changjun Chen
Affiliation:
College of Mechanical and Electrical Engineering, Soochow University, Suzhou, Jiangsu 215131, China
Xiaonan Wang
Affiliation:
Shagang School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215131, China
Xiaming Chen
Affiliation:
Shagang School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215131, China
Qiong Nian*
Affiliation:
Department of Mechanical Engineering, Arizona State University, Tempe, Arizona 85281, USA
*
a)Address all correspondence to this author. e-mail: qiong.nian@asu.edu
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Abstract

In this report, bulk graphene–reinforced titanium (Ti–Gr) nanocomposite with millimeter thickness was fabricated by selective laser melting process. Demonstrated by the characterizations of scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectra, graphene nanoplatelets were successfully embedded into the titanium matrix with a uniform dispersion due to a fast heating–cooling process. High-resolution transmission electron microscopy was used to investigate the interface between titanium and graphene, where a certain amount of carbide was formed attribute to the chemical reaction between them during multilayer laser melting. A high density of dislocations was observed surrounding the graphene nanoplatelets in titanium matrix. The strength and elastic modulus of the nanocomposites were significantly improved, which has been demonstrated by nano-indentation tests. The hardness of the bulk Ti–Gr nanocomposites was approximately 1.27 times higher than pristine Ti counterpart. The strengthening mechanisms were discussed in detail.

Keywords

nanocompositesgrapheneselective laser melting
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 10 , 28 May 2019 , pp. 1744 - 1753
Copyright
Copyright © Materials Research Society 2019 

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