Interface and mechanical properties of the single-layer long fiber reinforced Wf/W composites fabricated via field assisted sintering technology br

作者:Shu, Rui; Mao, Yiran*; Coenen, Jan W.; Terra, Alexis; Liu, Chao; Schoenen, Stephan; Riesch, Johann; Linsmeier, Christian; Broeckmann, Christoph
来源:Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing , 2022, 857: 144098.
DOI:10.1016/j.msea.2022.144098

摘要

Tungsten fiber reinforced tungsten composites (Wf/W) show a pseudo-ductile behavior because of extrinsic toughening mechanisms such as interface de-bonding, pull-out and plastic deformation of the fiber. In the present work, single-layer long fiber Wf/W composites with and without yttrium oxide (Y2O3) interface were fabricated by a field assisted sintering technology (FAST) process. The microstructure and mechanical properties of the prepared Wf/W composites were characterized. The fracture behavior and toughening mechanisms were analyzed in detail combining the results of experiments and finite element modelling. Wf/W composites with Y2O3 interface (weak interfacial strength) show a typical pseudo-ductile fracture behavior and a higher flexural strength than the composites without Y2O3 interface (strong interfacial strength). The fracture energy dissipation is mainly driven by plastic deformation of the fibers, but interface de-bonding is a necessary factor to ensure any extrinsic toughening mechanisms.

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