Tungsten fiber reinforced tungsten composites (W_f/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 W_f/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 W_f/W composites were characterized. The fracture behavior and toughening mechanisms were analyzed in detail combining the results of experiments and finite element modelling. W_f/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.

钨纤维增强钨复合材料 (W _f /W) 由于外在增韧机制（例如界面脱粘、拉出和纤维的塑性变形）而表现出假延性行为。在目前的工作中，通过场辅助烧结技术 (FAST) 工艺制造了具有和不具有氧化钇 (Y ₂ O ₃ ) 界面的单层长纤维 W _{f /W 复合材料。表征了制备的W f} /W复合材料的微观结构和力学性能。结合实验结果和有限元建模，详细分析了断裂行为和增韧机制。W _f /W 与 Y ₂ O _{3的复合材料界面（弱界面强度）表现出典型的假韧性断裂行为和比没有Y 2} O ₃界面的复合材料更高的抗弯强度（强界面强度）。断裂能量耗散主要由纤维的塑性变形驱动，但界面脱粘是确保任何外在增韧机制的必要因素。