As the primary candidate material for plasma facing components (PFCs) in fusion reactor, the serious brittleness of tungsten has become an urgent issue to be solved. In this work, a multi-doped W-Hf-YO alloy was prepared by high-energy ball milling and spark plasma sintering, aiming at improving its toughness through formation of complex oxide particles. Complex YHfO with pyrochlore structure were developed in the multi-doped WHY alloy due to dissolution and precipitation mechanism, which was confirmed by the combined characterization results of X-ray diffraction (XRD), electron probe microanalysis (EPMA) and transmission electron microscope (TEM). Complex oxide particles of YHfO with average size of 38.8 nm were densely distributed in the alloy. The formation of complex YHfO particles with nano-scale size not only consumed the impurity of oxygen, but also played a critical role in grain refinement because of Zener pinning effect. Improvement in mechanical properties of the multi-doped WHY alloy was then achieved, and the fracture toughness and compressive strength reached 19.7 MPa·m and 2223.4 MPa, respectively.

中文翻译：

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通过形成复合氧化物颗粒协同提高多掺杂W-Hf-Y2O3合金的韧性和强度


作为聚变反应堆面向等离子体组件（PFC）的主要候选材料，钨的严重脆性已成为亟待解决的问题。在这项工作中，通过高能球磨和放电等离子烧结制备了多掺杂W-Hf-YO合金，旨在通过形成复合氧化物颗粒来提高其韧性。由于溶解和沉淀机制，多掺杂WHY合金中形成了具有烧绿石结构的复合YHfO，X射线衍射（XRD）、电子探针显微分析（EPMA）和透射电子显微镜（TEM）的综合表征结果证实了这一点。 ）。合金中密集分布着平均尺寸为38.8 nm的YHfO复合氧化物颗粒。纳米级尺寸的复合YHfO颗粒的形成不仅消耗了氧的杂质，而且由于齐纳钉扎效应对晶粒细化起到了关键作用。多掺杂WHY合金的机械性能得到改善，断裂韧性和抗压强度分别达到19.7 MPa·m和2223.4 MPa。