Microstructure and mechanical properties of tungsten composite reinforced by fibre network

doi:10.1007/s11706-017-0378-8

Front. Mater. Sci.

2017, Vol. 11

Issue (2) : 190-196 https://doi.org/10.1007/s11706-017-0378-8

RESEARCH ARTICLE

Microstructure and mechanical properties of tungsten composite reinforced by fibre network

Linhui ZHANG^1,², Yan JIANG¹, Qianfeng FANG^1,²(

), Zhuoming XIE^1,², Shu MIAO^1,², Longfei ZENG^1,², Tao ZHANG¹, Xianping WANG¹, Changsong LIU¹

¹. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
². Graduate School, University of Science and Technology of China, Hefei 230026, China

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Abstract

In this paper the tungsten-fibre-net-reinforced tungsten composites were produced by spark plasma sintering (SPS) using fine W powders and commercial tungsten fibres. The relative density of the samples is above 95%. It was found that the recrystallization area in the fibres became bigger with increasing sintering temperature and pressure. The tungsten grains of fibres kept stable when sintered at 1350°C/16 kN while grown up when sintered at 1800°C/16 kN. The composite sintered at 1350°C/16 kN have a Vickers-hardness of ~610 HV, about 2 times that of the 1800°C/16 kN sintered one. Tensile tests imply that the temperature at which the composites (1350°C/16 kN) begin to exhibit plastic deformation is about 200°C–250°C, which is 400°C lower than that of SPSed pure W. The tensile fracture surfaces show that the increasing fracture ductility comes from pull-out, interface debonding and fracture of fibres.

Keywords tungsten-fibre-net spark plasma sintering recrystallization tensile test

Corresponding Author(s): Qianfeng FANG

Online First Date: 08 May 2017 Issue Date: 26 May 2017

Cite this article:

Linhui ZHANG,Yan JIANG,Qianfeng FANG, et al. Microstructure and mechanical properties of tungsten composite reinforced by fibre network[J]. Front. Mater. Sci., 2017, 11(2): 190-196.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-017-0378-8
https://academic.hep.com.cn/foms/EN/Y2017/V11/I2/190

Fig.1 SEM images of W_f/W samples sintered at different temperatures/pressures: (a) 1500°C/14 kN; (b) 1500°C/15 kN; (c) 1500°C/16 kN; (d) 1600°C/16 kN; (e) 1700°C/16 kN; (f) 1800°C/16 kN.

Fig.2 EBSD images of W_f/W-1400-16: (a) EBSD of fibre, grain growth of fibre and matrix; (b) aspect ratio of fibre; (c) grain size of fibre with grain growth; (d) grain size of matrix.

Tab.1 The chemical compositions of as-received tungsten powders

Fig.3 The schematic pictures of recrystallization process in fibres: (a) the fabrication process of fibres; (b) the influence of tungsten powders; (c) the grain growth in fibres.

Tab.2 Mass fraction of fibre, relative density, and Vickers hardness on fibre and matrix

Fig.4 SEM images of the fracture surface of W_f/W-1350-16 samples at RT: (a) fracture surface; (b) fibre; (c) interface; (d) matrix.

Fig.5 Tensile strength and total elongation of the W_f/W-1350-16 composites tested at different temperatures.

Fig.6 SEM images of the fracture surface in W_f/W composites tensile-tested at the temperature of (a) 200°C and (b) 300°C, showing characteristics of a single fibre: (c) pull-out; (d) necking; (e) splitting; (f) fracture surface of fibre.

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