TY  - JOUR
AU  - Jasper, Bruno
AU  - Coenen, Jan W.
AU  - Riesch, Johann
AU  - Höschen, Till
AU  - Bram, Martin
AU  - Linsmeier, Christian
TI  - Powder Metallurgical Tungsten Fiber-Reinforced Tungsten
JO  - Materials science forum
VL  - 825-826
SN  - 1662-9752
CY  - Uetikon
PB  - Trans Tech Publ.
M1  - FZJ-2015-06314
SP  - 125 - 133
PY  - 2015
AB  - The composite material tungsten fiber-reinforced tungsten (Wf/W) addresses the brittleness of tungsten by extrinsic toughening through introduction of energy dissipation mechanisms. These mechanisms allow the release of stress peaks and thus improve the materials resistance against crack growth. Wf/W samples produced via chemical vapor infiltration (CVI) indeed show higher toughness in mechanical tests than pure tungsten. By utilizing powder metallurgy (PM) one could benefit from available industrialized approaches for composite production and alloying routes. In this contribution the PM method of hot isostatic pressing (HIP) is used to produce Wf/W samples. A variety of measurements were conducted to verify the operation of the expected toughening mechanisms in HIP Wf/W composites. The interface debonding behavior was investigated in push-out tests. In addition, the mechanical properties of the matrix were investigated, in order to deepen the understanding of the complex interaction between the sample preparation and the resulting mechanical properties of the composite material. First HIP Wf/W single-fiber samples feature a compact matrix with densities of more than 99% of the theoretical density of tungsten. Scanning electron microscopy (SEM) analysis further demonstrates an intact interface with indentations of powder particles at the interface-matrix boundary. First push-out tests indicate that the interface was damaged by HIPing. 
LB  - PUB:(DE-HGF)16
DO  - DOI:10.4028/www.scientific.net/MSF.825-826.125
UR  - https://juser.fz-juelich.de/record/256355
ER  -