钨基合金被认为是最有潜力的能够应用于聚变反应堆高温环境的材料，但商业纯钨的脆性极大地限制了其应用。氧化物弥散强化（ODS）是改善钨基合金韧性的有效途径之一，但目前的ODS-W中氧化物颗粒尺寸较大，达不到理想的强韧化效果。针对这一问题，本项目将以W-Ti(Zr)-Y2O3体系为研究对象，借鉴ODS-Fe中采用固溶-沉淀机制将氧化物颗粒尺寸控制在3nm以下的经验，通过机械合金化、预退火处理、致密化烧结以及随后的热轧和退火处理，制备出氧化物颗粒尺寸在10nm以下的钨基块体材料。研究氧化物颗粒的尺寸和分布随球磨参数和热处理参数的演化规律，阐明氧化物颗粒的细化机理。表征材料的力学性能，抗高热负荷冲击性能和抗辐照性能，阐明氧化物颗粒尺寸减小后ODS-W基材料性能优化的物理本质。项目研究成果将为钨基材料在未来聚变反应堆的应用提供科学依据，也为其他高强韧材料的研发提供新思路。

Tungsten-based alloys are considered as the most potential candidates that can be applied in the high temperature environment of future fusion reactor, however the intrinsic brittleness of the commercial pure tungsten limited such application. Oxide dispersion strengthening (ODS) is one of the most effective methods to improve the toughness of W-based alloys, but the relatively large oxide particles decrease the capability of ODS-W in toughness enhancement. In order to settle such problem, this project is to fabricate ODS-W alloys (W-Ti/Zr-Y2O3) with oxide particle size less than 10 nm via processes such as mechanical alloying, pre-thermal treatment, sintering, and hot rolling and annealing, according to the mechanism of solution-precipitation in the ODS-Fe that controls the oxide particle size being less than 3 nm. It is to investigate the evolution of oxide particle size and distribution with the milling and thermal treating parameters, to elucidate the refining mechanism of oxide particles, to characterize the mechanical properties, high-load heat shock resistance, and irradiation resistance, and to clarify the mechanism of properties enhancement of the ODS after size refinement. The achievements of this project will afford scientific basis for the ODS-W to be applied in future fusion reactor and provide new method for research and development of other materials with high strength and high toughness.