Microstructure and mechanical properties of tungsten composite reinforced by fibre network
Linhui ZHANG , Yan JIANG , Qianfeng FANG , Zhuoming XIE , Shu MIAO , Longfei ZENG , Tao ZHANG , Xianping WANG , Changsong LIU
Front. Mater. Sci. ›› 2017, Vol. 11 ›› Issue (2) : 190 -196.
Microstructure and mechanical properties of tungsten composite reinforced by fibre network
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.
tungsten-fibre-net / spark plasma sintering / recrystallization / tensile test
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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