Interface Characteristics and Damping Performance of Ni-coated Short Carbon Fiber Reinforced AZ91D Magnesium Matrix Composites

doi:10.11901/1005.3093.2016.159

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 74-80 DOI: 10.11901/1005.3093.2016.159

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Interface Characteristics and Damping Performance of Ni-coated Short Carbon Fiber Reinforced AZ91D Magnesium Matrix Composites

Fuzhong REN(

),Sizhan WU,Wei SHI

College of Material and Chemical Engineering, Tongren University, Tongren 554300, China

Cite this article:

Fuzhong REN,Sizhan WU,Wei SHI. Interface Characteristics and Damping Performance of Ni-coated Short Carbon Fiber Reinforced AZ91D Magnesium Matrix Composites. Chinese Journal of Materials Research, 2017, 31(1): 74-80.

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Abstract

Carbon fiber/Mg-alloy composites were fabricated by powder metallurgy technique using short carbon fibers without and with electroless plated Ni-coating as reinforcer and AZ91D powder as matrix．Then their interfacial morphology, elemental composition,mechanical properties and damping capacities were characterized by means of SEM,TEM-EDS,tensile tests and dynamic mechanical analyzer (DMA)．Results shows that the carbon fibers are uniformly distributed in the composites and preferentially oriented paralleling to the extrusion direction．The Ni coating improves the wettability between the carbon fibers and AZ91D matrix. Based on the strain spectrum by different frequency strain and G-L characteristic line, it follows that there should be a damping mechanism other than the known dislocation damping mechanism for the composite. With the increasing strain frequency, the control step for the damping performance of composite changes mainly from interface slip to dislocation. The damping capacity of Ni-coated carbon fiber reinforced magnesium matrix composites increase with the rising temperature. One damping peak exists in the range of 250~300 ℃.The peak temperature moves to higher temperature with the increasing frequency,which shows the characteristics of the thermal activation of relaxation process. According to the Arrhenius formula the calculated thermal activation is 3.448 eV.

Key words: composite damping dynamic thermomechanic analysis short carbon fiber AZ91D

Received: 24 March 2016

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	Fuzhong REN
	Sizhan WU
	Wei SHI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.159 OR https://www.cjmr.org/EN/Y2017/V31/I1/74

Fig.1 Morphology of coated short carbon fibers

Fig.2 Morphology of AZ91D magnesium alloy powders

Fig.3 Composite bar after hot extrusion

Fig.4 Sample for tensile test (unit: mm)

Fig.5 Sample for damping test

Table 1 Measurement conditions for damping parameters

Fig.6 Distribution of carbon fibers in the magnesium-matrix composite (a) and (b) are uncoated carbon fibers;(c) and (d) are coated carbon fibers

Fig.7 Line-scanning EDS results of the coated fiber reinforced magnesium matrix composite on the cross-section (a) morphology, (b) EDS spectrum

Fig.8 Morphology (a) and energy spectrum analysis (b) of composite interface

Fig.9 Comparison of tensile mechanical performance among three different materials

Fig.10 Morphology of the tensile fracture surface of magnesium matrix composite with coated carbon fibers reinforcement (a); uncoated carbon fibers reinforcement (b)

Fig.11 Comparison of damping values change with strain amplitude to three different materials (f=1 Hz)

Fig.12 Comparison of damping values change with strain amplitude to three different materials (f=4 Hz)

Fig.13 Comparison of damping values change with strain amplitude to three different materials (f=10 Hz)

Table 3 Variation of the peak temperature of 5.0% (volume fraction) Ni-coated cf/AZ91D composite

Fig.14 G-L line of two different composite

Fig.15 Q ^-1-f-T characteristic curves of 5.0% (volume fraction) Ni-coated cf/AZ91D

Fig.16 Arrhenius relation between testing frequency and peak temperature

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