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Materials 2019, 12(1), 174; https://doi.org/10.3390/ma12010174

Microstructure and Flexural Properties of Z-Pinned Carbon Fiber-Reinforced Aluminum Matrix Composites

1
College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China
2
Information Technology Department, Qingdao Vocational and Technical College of Hotel Management, Qingdao 266100, China
3
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 28 December 2018 / Accepted: 28 December 2018 / Published: 7 January 2019
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Abstract

Z-pinning can significantly improve the interlaminar shear properties of carbon fiber-reinforced aluminum matrix composites (Cf/Al). However, the effect of the metal z-pin on the in-plane properties of Cf/Al is unclear. This study examines the effect of the z-pin on the flexural strength and failure mechanism of Cf/Al composites with different volume contents and diameters of the z-pins. The introduction of a z-pin leads to the formation of a brittle phase at the z-pin/matrix interface and microstructural damage such as aluminum-rich pockets and carbon fiber waviness, thereby resulting in a reduction of the flexural strength. The three-point flexural test results show that the adding of a metal z-pin results in reducing the Cf/Al composites’ flexural strength by 2–25%. SEM imaging of the fracture surfaces revealed that a higher degree of interfacial reaction led to more cracks on the surface of the z-pin. This crack-susceptible interface layer between the z-pin and the matrix is likely the primary cause of the reduction of the flexural strength. View Full-Text
Keywords: metal–matrix composites (MMCs); carbon fiber; mechanical properties; z-pin reinforcement; laminate metal–matrix composites (MMCs); carbon fiber; mechanical properties; z-pin reinforcement; laminate
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Wang, S.; Zhang, Y.; Sun, P.; Cui, Y.; Wu, G. Microstructure and Flexural Properties of Z-Pinned Carbon Fiber-Reinforced Aluminum Matrix Composites. Materials 2019, 12, 174.

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