本发明公开了一种高性能超细晶钼镧合金的制备方法,包括以下步骤：1)球形纳米La₂O₃的制备；2)钼粉的制备；3)混合粉体的制备；4)钼合金的制备：将混合粉体进行配重后,进行SPS快速烧结,得到La₂O₃的-Mo钼合金。本发明采用水浴法制备La₂O₃的第二相,通过控制水浴的时间长短和冷却速度的大小可以达到控制第二相的大小和相貌的目的,从而得到十分细小的球形La₂O₃的,而第二相颗粒越小,分布越均匀,越容易进入Mo合金晶粒内部,并具有更明显的强化效果。本发明中的球形La₂O₃的的强化效果最好,由于应力集中趋势较小,发生微裂纹的可能性较小,断裂强度可以进一步得到改善,裂纹将偏离原来的主要扩展方向,形成位错环,从而提升屈服强度抗拉强度。

The present invention discloses a method for preparing a high performance ultra fine crystalline molybdenum lanthanide alloy comprising 1) preparation of spherical nanoLa₂O₃; 2) preparation of molybdenum powder; 3) preparation of mixed powder; 4) preparation of molybdenum alloy: After weighing the mixed powder, SPS rapid sintering is performed to obtain the-Mo molybdenum alloy of La₂O₃.The present invention prepares the second phase of La₂O₃ by controlling the water bath method, thus controlling the size and appearance of the second phase and the cooling speed of the water bath to obtain the very small spherical La₂O₃, while the smaller the second phase particle, the more uniform the distribution, the easier to enter the Mo alloy grain and has a more obvious reinforcement effect. The reinforcement effect of the spherical La₂O₃ in the present invention is best, since the small trend of stress concentration and the less possibility of microcrack, the fracture strength can be further improved, the crack will deviate from the original main expansion direction, form a dislocation ring, thus enhancing the yield strength tensile strength.