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Advancements in Materials, Vol. 2, Issue 2, Apr  2018, Pages 1-8; DOI: 10.31058/j.am.2018.22001 10.31058/j.am.2018.22001

Microstructure and Debris Fracture for Crystalline Ni-P-Cnts Composite Coatings After Wear

, Vol. 2, Issue 2, Apr  2018, Pages 1-8.

DOI: 10.31058/j.am.2018.22001

Bai Liu *1 , Zhumei Song 2

1 School of Mechanical and Electronic Engineering, Shenzhen Institute of Information Technology, Shenzhen, Guangdong Province, China

2 School of Traffic and Environment, Shenzhen Institute of Information Technology, Shenzhen, Guangdong Province, China

Received: 28 November 2017; Accepted: 20 February 2018; Published: 19 April 2018

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Abstract

The purposes of this study are to determine the effects of CNTs on Microstructure and wear Fracture for Crystalline Ni-P-CNTs Composite Coatings after Wear. Crystalline Ni-P-CNTs composite coatings were prepared via brush electroplating technology. Then wear tests for the coatings were carried out. The deformation of the microstructures in the coatings after wear was analyzed by TEM. The results showed that loads make mainly a dislocation movement and proliferation that causes dislocation configuration changes in crystalline Ni-P/CNTs composite coating. As the applied load increases, the dislocation configuration changes from dislocation tangles to the formation of cell, again to cell deformation. Abrasive debris was collected for SEM observation which is helpful to understand the microscopic mechanism of wear crack nucleation and propagation. Fracture modes for the debris in crystalline Ni-P/CNTs composite coating are micro-plastic deformation intergranular, cleavage and quasi-cleavage. Fracture characteristics on the abrasive debris are cleavage steps, micro-cutting stripes, grain groups and torn edges. Crack nucleation sites for the debris generally are inter-granular defects, such as dislocation piles and cell walls, and grain boundaries. The crack propagation paths are cleavage planes and grain boundaries.

Keywords

CNTs, Coating, Wear, Microstructure, Fracture

Copyright

© 2017 by the authors. Licensee International Technology and Science Publications (UK). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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