Microstructure and Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced AZ91 Matrix Composite

doi:10.11900/0412.1961.2019.00173

Acta Metall Sin

2019, Vol. 55

Issue (12): 1537-1543 DOI: 10.11900/0412.1961.2019.00173

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Microstructure and Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced AZ91 Matrix Composite

QIN Jiayu^1,²,LI Xiaoqiang^1,²,JIN Peipeng^1,²,WANG Jinhui^1,²,ZHU Yunpeng^1,^2,³(

)

1. Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai University, Xining 810016, China
2. Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining 810016, China
3. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Cite this article:

QIN Jiayu, LI Xiaoqiang, JIN Peipeng, WANG Jinhui, ZHU Yunpeng. Microstructure and Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced AZ91 Matrix Composite. Acta Metall Sin, 2019, 55(12): 1537-1543.

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Abstract

Magnesium alloys are well known for their low density, high specific strength. However, they are often limited by unsatisfactory mechanical properties. To meet the challenge of growing demand for light structural applications, metal matrix composites (MMCs) have attracted more attention. Carbon nanotubes (CNTs) have attracted much attention as the ideal reinforcements for MMCs due to their excellent mechanical strength and Young's modulus. In this work, 0.1%CNTs/AZ91 (mass fraction) magnesium matrix composites were prepared by low temperature powder metallurgy and hot extrusion. The magnesium alloy and composites were observed and analyzed by SEM, XRD and TEM. The room temperature mechanical properties of the composites were tested by Instron 5982 machine. The results showed that the CNTs distributed uniformly in the composites. The CNTs have an effect on reducing grain size, promoting precipitation of β-Mg₁₇Al₁₂ and weakening basal texture. The compressive strength and yield strength of the composites reached 617 and 445 MPa, which increased by 8.8% and 7.2%, respectively. The tensile strength and yield strength were 393 and 352 MPa, which 4.5% and 6.0% MPa higher than the matrix, respectively. It can be found that fine grain strengthening and load transfer play a leading role in improving the strength in the 0.1%CNTs/AZ91 magnesium matrix composites.

Key words: magnesium matrix composite low temperature powder metallurgy microstructure mechanical property strengthening mechanism

Received: 31 May 2019

ZTFLH:

TB333

Fund: National Natural Science Foundation of China(No.51661028);Qinghai Provincial Science and Technology Project(No.2018-GX-A1)

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	QIN Jiayu
	LI Xiaoqiang
	JIN Peipeng
	WANG Jinhui
	ZHU Yunpeng

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00173 OR https://www.ams.org.cn/EN/Y2019/V55/I12/1537

Fig.1 Morphologies of raw AZ91 alloy powders (a) and carbon nanotubes (CNTs) (b) (Inset in Fig.1b shows the SAED pattern of CNTs)

Fig.2 XRD spectra of CNTs, AZ91 and 0.1%CNTs/AZ91 composite (Inset shows the high-magnification of XRD spectra)

Fig.3 TEM images (a, c) and grain size distributions (b, d) of as-extruded AZ91 alloy (a, b) and 0.1%CNTs/AZ91 composite (c, d) (DRX—dynamic recrystallization)

Fig.4 Distribution of CNTs and Mg₁₇Al₁₂ in 0.1%CNTs/AZ91_{composite (a) and interfacial microstructure between CNTs and AZ91 (b)}

Fig.5 {0001} and {10

1 ˉ

0} pole figures of as-extruded AZ91 alloy (a) and CNTs/AZ91 composite (b) (ED—extruded direction, TD—transverse direction)

Fig.6 Compressive (a) and tensile (b) stress-strain curves of as-extruded AZ91 alloy and 0.1%CNTs/AZ91 composite

Table 1 Mechanical properties of this work with other reported Mg matrix composites^{[7,11,18,19,33,34]}

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