TY  - JOUR
AU  - Mao, Yiran
AU  - Coenen, Jan
AU  - Sistla, Sree
AU  - Liu, Chao
AU  - Terra, Alexis
AU  - Tan, Xiaoyue
AU  - Riesch, Johann
AU  - Hoeschen, Till
AU  - Wu, Yucheng
AU  - Broeckmann, Christoph
AU  - Linsmeier, Christian
TI  - Design of tungsten fiber-reinforced tungsten composites with porous matrix
JO  - Materials science and engineering / A
VL  - 817
SN  - 0921-5093
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2021-04033
SP  - 141361 -
PY  - 2021
AB  - To overcome the brittleness of tungsten, tungsten fiber-reinforced tungsten composites (Wf/W) have been developed using an extrinsic toughening mechanism. In this work, a novel type of Wf/W with porous matrix produced by field assisted sintering technology (FAST) is studied. The material is optimized regarding mechanical behavior, standing on the adjusting of matrix porosity and fiber mass fraction. Two series of samples with different matrix density and fiber mass fraction are prepared. Based on the mechanical testing, porous matrix Wf/W can represent a promising pseudo ductile behavior. Relatively lower matrix density is helpful to avoid a sudden load-drop during crack opening. The different fracture behavior is attributed to the different fiber/matrix interface bonding condition. By increasing fiber mass fraction from 20% to 50%, porous matrix Wf/W can facilitate improved mechanical properties regarding fracture toughness and strength. However, by further increasing the fiber mass fraction from 50% to 60%, a deterioration of mechanical properties is observed. The high porosity of porous matrix Wf/W causes a degradation of the thermal conductivity compared to conventional bulk tungsten. No significant change regarding thermal expansion coefficient is observed when decreasing the matrix density.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000659100000003
DO  - DOI:10.1016/j.msea.2021.141361
UR  - https://juser.fz-juelich.de/record/902102
ER  -