Microstructure and mechanical properties of tungsten composite reinforced by fibre network
Linhui ZHANG1,2, Yan JIANG1, Qianfeng FANG1,2(), Zhuoming XIE1,2, Shu MIAO1,2, Longfei ZENG1,2, 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
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.
Chemical composition (mass fraction) corresponding to different grain sizes /ppm
200 nm
500 nm
Na
3
5
Mo
15
16
O
4600
2200
Bi
1
1
Cd
1
1
Cu
1
1
Pb
1
1
Sn
1
1
Al
5
5
As
5
5
Ca
5
5
Co
5
5
Cr
5
5
Ti
5
5
Ni
5
5
Sb
5
5
Si
5
5
V
5
5
Mn
5
5
Mg
5
5
S
5
5
P
5
5
K
6
6
Fe
10
10
W
in balance
in balance
Tab.1
Fig.3
Sample
Mass fraction of fibre /%
Relative density /%
Vickers hardness/HV0.2
Fibre
100
99.8
668±11
Wf/W-1350-16
22.3±0.1
95.7±0.2
612±9 (fibre)
616±8 (matrix)
Wf/W-1800-16
22.5±0.2
95.2±0.3
384±8 (fibre)
300±6 (matrix)
Tab.2
Fig.4
Fig.5
Fig.6
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