The secondary phase particles of La₂O₃ play a crucial role in the determination of the yield strength over MoLa alloys, but few work focuses on their intrinsic modulation of shape and size. Herein, a nanostructuring strategy of the secondary phase particles is proposed to enhance the mechanical performances of MoLa alloys, in which the shape and size effects of secondary phase particles have been discussed. Moreover, the strengthening mechanism is also analyzed. It is found that the La₂O₃ nanospheres with a small size of 84 nm exhibit the best strengthening ability, leading to a high yield strength of 765 MPa in the sintered state. Smaller particles are easily involved into the Mo matrix interior to be intragranular, which are beneficial for the further strengthening. The strengthening contributions are quantitatively calculated, providing a predicted yield strength value, which is in good agreement with the measured one.

La ₂ O ₃的第二相颗粒在确定MoLa合金的屈服强度方面起着至关重要的作用，但很少有工作致力于其形状和尺寸的内在调节。在本文中，提出了次级相颗粒的纳米结构化策略以增强MoLa合金的机械性能，其中讨论了次级相颗粒的形状和尺寸效应。此外，还分析了强化机理。发现La ₂ O ₃尺寸为84 nm的纳米小球表现出最佳的增强能力，在烧结状态下可产生765 MPa的高屈服强度。较小的颗粒容易进入Mo基质内部而成为颗粒内颗粒，这有利于进一步强化。定量计算出增强作用，提供了预测的屈服强度值，该值与所测得的值非常吻合。