Synergistic Effects of Carbon Nanotube (CNT) and Reduced Graphene Oxide (RGO) on Mechanical and Thermal Properties of ZK61 Alloy

doi:10.1007/s40195-023-01534-7

Abstract

Abstract:

The hybrid of carbon nanotube (CNT) and reduced graphene oxide (RGO) reinforced ZK61 composite was fabricated by a hot extrusion process. Compared with the raw ZK61 alloy and single-reinforced composites, the hybrid-reinforced by RGO + CNT complex exhibited significant enhancements both in mechanical and thermal performance. By adjusting the proportion of RGO and CNT in ZK61 alloy, the obtained optimum ZK61/(0.06 wt% RGO + 0.54 wt% CNT) composite exhibited increase of 25.4% in yield strength, 26.5% in ultimate tensile strength, 104% in failure strain and 30.4% in thermal conductivity, respectively, in comparison with ZK61 alloy. The superior properties of the nano-hybrid composite are attributed to the synergetic effects of RGO and CNT, leading to a uniform dispersion and integrated structure as well as the enhanced interfacial bonding with matrix. The strengthening ability of RGO and CNT was calculated to quantify their individual contribution to the improvement in mechanical and thermal properties of the ZK61 matrix composite. The RGO + CNT hybrids provide a promising way to develop Mg matrix composites with impressive performances.

Key words: Mg matrix composite, Carbon nanotube, Reduced graphene oxide, Mechanical performance, Thermal conductivity

Fanjing Meng, Wenbo Du, Ning Ding, Jian Sun, Xian Du, Ke Liu, Shubo Li. Synergistic Effects of Carbon Nanotube (CNT) and Reduced Graphene Oxide (RGO) on Mechanical and Thermal Properties of ZK61 Alloy[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(3): 577-585.

Figures/Tables 9

Table 1 Characteristics of raw materials used in the present experiment

Materials	Purity	Functional groups content	Particle size
CNT-COOH	> 98 wt%	1.23 wt%	Average length: 0.5-2.0 μm
			Average diameter: 20-30 nm
GO	> 99 wt%	~ 35 wt%	Average thickness: 0.5-1.2 nm
			Layer size: 0.5-3.0 μm
ZK61 powder	> 99.9 wt%	-	Average diameter: 48-50 μm

Fig. 1 Absorbance a, Raman spectrum b-d and TEM images e-g of carbon nanomaterials supernatant of ethanol

Fig. 2 OM a, d, g, SEM b, e, h images and the EDS result of C element c, f, i of the ZK61 composites with 0.6 wt% RGO a-c, 0.6 wt% CNT d-f, 0.6 wt% RGO + CNT (RGO: CNT = 1:9) g-i

Fig. 3 SEM images of the morphologies of carbon materials in the ZK61 composites with 0.6 wt% RGO a, 0.6 wt% CNT b, 0.6 wt% RGO + CNT (RGO: CNT = 1:9) c

Fig. 4 TEM images of the interface in the ZK61 composites with 0.6 wt% RGO a, 0.6 wt% CNT b, 0.6 wt% RGO + CNT (RGO: CNT = 1:9) c, followed by the enlarged views of the selected areas I and II; EDS results of the selected points (P1-P3) in Fig. 4a-c d

Fig. 5 Mechanical performances of the ZK61/carbon materials composites with 0.6 wt% RGO, 0.6 wt%CNT, 0.6 wt% RGO + CNT: the tensile stress-strain curves a, the stress b and the strain c with different RGO: CNT ratios

Fig. 6 TD and TC of the ZK61 alloy reinforced with 0.6 wt% carbon materials with different RGO: CNT ratios

Fig. 7 Schematic view of the synergistic strengthening ability of RGO, CNT on ZK61 alloy

Table 2 Details of A, B, C, D in Fig. 7

TYS (MPa)				TC (W/(mK))
A_y	322	A_y-B_y	53	A_t	142	A_t-B_t	15
B_y	269	C_y-D_y	23	B_t	127	C_t-D_t	11
C_y	280	A_y-C_y	42	C_t	120	A_t-C_t	22
D_y	257	B_y-D_y	12	D_t	109	B_t-D_t	18

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