(Co_(78)Fe_(22))_3V中层错与反相畴界的相互作用

Interaction Between SF and APB in

本文比较了淬火无序态(Co_(78)Fe_(22))_3V在经过冷加工然后退火和未经过冷加工直接退火两种情况下的显微组织,对于无序-有序转变过程中形成稳定层错的机制提出了与前人不同的看法,认为是位移矢量为1/6〈112〉的层错与位移矢量为1/2〈110〉的反相畴界反应生成位移矢量为1/3〈112〉的超点阵内禀层错(SISF)的结果。在冷加工引入大量位错的情况下,位错分解为层错,并与反相畴界反应,生成密集的SISF层错四面体胞群,在720℃48h退火后仍保持几十纳米的细小尺寸。

The microstructure of ( Co78 Fe22 )3V alloy annealed after cold - rolling in initially quenching - disordered state was studied and compared with that annealed without being first cold rolled. The results indicated that SISF energy is much lower than APB energy in the ordered state. The SF with 1/6 < 112 > displacement vector formed during disorder - order transformation may turn into SISF by reaction with APB and keep stable after ordering was accomplished. In the case of introducing a lot of dislocations by cold - rolling, the dislocations extended into SFs and turned into SISFs, resulting in dense cell - networks of SISF tetrahedrons, which were stable with fine size of only - 50nm even after annealing 48h at 720℃ .