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金属间化合物(Co_(78)Fe_(22))_3V从临界温度之上淬火可得无序态,冷加工后在退火中表现出很强的硬化效应,其硬化幅度远大于单纯的有序强化。通过TEM观察确定,这种应变时效硬化是由于冷加工位错组织在退火中随着有序化进程转变为一种特别的位错一层错网络的结果:位错普遍扩展为{111}面层错,通过{111}面相交线上偏位错反应生成Lomer-Cottrell结线而互相联结,发展为以层错四面体为小胞的密集网络。形成这种特殊位错组织是由于在有序转变中层错能发生急剧下降和位错组态出现相应调整的结果。实验结果表明,有序(Co_(78)Fe_(22))_3V的层错能很低而反相畴界能较高且各向同性,因此,这种有序合金的屈服应力随温度上升而提度的机制不可能是通常认为的Keow-Wilsdof障碍,而可能是Lomev-Cottfell障碍。
The intermetallic compound (Co_ (78) Fe_ (22)) _3V quenches from above the critical temperature to obtain a disordered state. After cold working, it shows a strong hardening effect during annealing, and its hardening range is much larger than that of simple ordered strengthening. It was confirmed by TEM observation that this strain hardening is due to the transformation of the cold working dislocation structure into a special dislocation-fault network as the ordering progresses during annealing: the dislocation generally extends to the {111} The Lomer-Cottrell junction was created by the misplacement of the {111} plane intersection lines, which led to the formation of a dense network of small, tetrahedra-like cells. The formation of this special dislocation organization is the result of a sharp drop in layer faults and a corresponding adjustment of the dislocation configuration in an orderly transition. The experimental results show that the ordered (Co_ (78) Fe_ (22)) _3V has a very low stacking fault energy and a high anti-phase boundary energy and isotropy. Therefore, the yield stress of this ordered alloy increases with temperature The mechanism for delegation can not be the Keow-Wilsdof disorder that is commonly thought of as a possible Lomev-Cottfell disorder.