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Additively manufactured copper matrix composites: Heterogeneous microstructures and combined strengthening effects

Published online by Cambridge University Press:  27 April 2020

Heng Ouyang ,
Ge Wang ,
Zan Li  and
Qiang Guo
Heng Ouyang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Ge Wang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Zan Li*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Qiang Guo*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to these authors. e-mail: njulizan@sjtu.edu.cn
b)e-mail: guoq@sjtu.edu.cn
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Abstract

We here design and fabricate a new kind of copper matrix composites, where titanium carbide nanoparticles are in situ incorporated into and embedded within the copper matrix, by virtue of laser powder-bed-fusion (L-PBF) process. We made a multiscale examination on the microstructures of the additively manufactured samples, unraveling that there are many unusual microstructural features, including grain refinement, the existence of high-density dislocations, and supersaturation of titanium solute atoms in the as-printed metal matrix composites. These unique microstructural features are mainly interpreted by the intense thermal history and the rapid solidification nature of the L-PBF process. The resultant composites then integrate the most important four strengthening mechanisms in metals: grain boundary strengthening, dislocation strengthening, solid solution strengthening, and second-phase strengthening, rendering this new kind of copper matrix composites a remarkably high yield strength (~490 MPa) and large uniform elongation (~12%), surpassing many high-performance copper matrix composites and copper alloys.

Keywords

compositestress/strain relationshipmicrostructure
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 15: Focus Issue: Additive Manufacturing of Metals: Complex Microstructures and Architecture Design , 14 August 2020 , pp. 1913 - 1921
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Copyright
Copyright © Materials Research Society 2020

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