With significantly enhanced irradiation resistance, high-temperature strength, and creep resistance, oxide-dispersion-strengthened tungsten (ODS-W) alloys present tremendous potential for high-temperature applications. However, the oxide particles tend to segregate at W grain boundary and grow up (even to micron), greatly suppressing their strengthening effect. It is always a great challenge to effectively refine and disperse the oxide particles at W grain boundary. Here, we successfully developed a new type of cation-doped W-Y₂O₃ alloy via a wet chemical method and subsequent low-temperature sintering. It was found that proper cation doping could not only significantly refine the intergranular Y₂O₃ second phase particles but also dramatically improve the sinterability of W matrix. These doping effects, as a result, simultaneously enhance the strength and ductility of the W-Y₂O₃ alloy. It was confirmed that the segregation of cation dopants at the W/Y₂O₃ interface is the origin of these doping effects. Furthermore, X-ray photoemission spectra (XPS) analyses confirmed that cation dopant segregation also obviously affects the chemical bonding (i.e., W-O bond) along the W/Y₂O₃ interface. As a result, the rate-limiting mechanism for W grain growth is influenced remarkably, explaining well the difference of W grain size in various cation-doped W-Y₂O₃ alloys. For the refinement of intergranular Y₂O₃ particles, it can be understood well from both thermodynamic and kinetic views. Detailedly, W/Y₂O₃ interfacial energy and atom mobility for Y₂O₃ coarsening are all limited by cation dopant segregation. More importantly, this cation-doping approach can also be applicable to other ODS alloys for enhancing their comprehensive mechanical properties.

氧化物弥散强化钨（ODS-W）合金具有显着增强的耐辐射性，高温强度和抗蠕变性，在高温应用中具有巨大的潜力。但是，氧化物粒子趋向于在W晶界偏析并长大（甚至达到微米级），大大抑制了它们的强化效果。有效地细化和分散氧化物颗粒在W晶界始终是一个巨大的挑战。在这里，我们通过湿化学方法和随后的低温烧结成功开发了一种新型的阳离子掺杂WY ₂ O ₃合金。发现适当的阳离子掺杂不仅可以显着细化晶间Y ₂ O ₃第二相颗粒也大大提高了W基体的烧结性。结果，这些掺杂效应同时增强了WY ₂ O ₃合金的强度和延展性。证实了在W / Y ₂ O ₃界面处阳离子掺杂剂的偏析是这些掺杂效应的起源。此外，X射线光发射光谱（XPS）分析证实，阳离子掺杂剂的偏析也明显影响沿W / Y ₂ O ₃界面的化学键（即WO键）。结果，显着影响了W晶粒生长的限速机制，很好地解释了各种阳离子掺杂WY ₂ O中W晶粒尺寸的差异。_3种合金。为了细化晶粒间Y ₂ O ₃颗粒，从热力学和动力学的观点都可以很好地理解。详细地，W / Y ₂ O ₃界面能和用于Y ₂ O ₃粗化的原子迁移率都受到阳离子掺杂剂偏析的限制。更重要的是，这种阳离子掺杂方法还可应用于其他ODS合金，以增强其综合机械性能。