【摘要】 对采用溶液燃烧合成法并结合不同掺杂方法（液-液（WL10）、液-固（WLNO）和固-固（WLO））制备的纳米尺度粉末及采用常压烧结法制备的超细晶W-1.0wt.%La₂O₃合金进行对比研究。与纯钨相比,W-1.0wt.%La₂O₃合金具有超细晶粒和优异的力学性能。烧结后,WLO样品的平均晶粒尺寸大于WL10和WLNO样品的平均晶粒尺寸;WL10和WLNO的显微硬度相差不大,但大于WLO的显微硬度。相对于其他样品,在1500℃烧结后的WL10样品中La₂O₃颗粒呈现最佳分布状态,均匀分布在晶界或晶粒内部,且平均尺寸最小,晶界和晶粒内部的La₂O₃颗粒平均尺寸分别为（57±29.7）和（27±13.1）nm。与传统方法制备的钨材料相比,采用液-液掺杂方法制备的W-1.0wt.%La₂O₃钨合金呈超细的显微组织和优异的性能。更多还原

【Abstract】 A comparative study was conducted by using solution combustion synthesis with three different doping routes（liquid-liquid（WL10）, liquid-solid（WLNO） and solid-solid（WLO）） to produce nanoscale powders and further fabricate the ultrafine-grained W-1.0 wt.%La₂O₃ alloys by pressureless sintering. Compared with pure tungsten, W-1.0 wt.%La₂O₃ alloys exhibit ultrafine grains and excellent mechanical properties. After sintering, the average grain size of the WLO sample is larger than that of WL10 and WLNO samples; the microhardness values of WL10 and WLNO samples are similar but larger than the value of WLO sample. The optimized La₂O₃ particles are obtained in the WL10 sample after sintering at 1500 ℃ with the minimum mean size by comparing with WLNO and WLO samples, which are uniformly distributed either at grain boundaries or in the grain interior with the sizes of（57±29.7） and（27±13.1） nm, respectively. This study exhibits ultrafine microstructure and outperforming mechanical properties of the W-1.0 wt.%La₂O₃ alloy via the liquid-liquid doping route, as compared with conventionally-manufactured tungsten materials.更多还原