Ni-Cr-Co高温合金回复行为的正电子湮没研究

STUDY OF RECOVERY IN DEFORMED Ni-Cr-Co SUPERALLOYS USING POSITRON ANNIHILATION TECHNEQUE

用正电子湮没技术及透射电镜研究了三种不同Co含量的 Ni-Cr-Co高温合金经室温形变后的回复再结晶过程.结果表明,在相同的形变量下,Co含量低的合金比 Co含量高的合金产生的缺陷多;在回复过程中,Co含量低的合金其位错回复比Co含量高的合金快,而且合金的表观再结晶激活能随Co含量的增加而增加.讨论了Co含量,表观再结晶激活能和层错能之间的关系以及它们对回复过程的影响。

The recovery recrystallization of 3 deformed Ni-Cr-Co superalloys with different Co contents has been studied using positron annihilation technique and TEM.The alloys with low Co content have more defects occurred than ones with high Cocontent, and the former may be faster in dislocation recovery than the later. Thus,the apparent activation energy of recrystallization increases with the increase of their Co content in alloys. The relationship botween apparent activation energy and stacking fault energy together with their effect on recovery were also discussed.