EBSD在Nimonic 80A动态再结晶机制研究中的应用

Application of EBSD in the study of dynamic recrystallization mechanisms in Nimonic 80A

本文采用背散射电子衍射(EBSD)技术对镍基高温合金Nimonic 80A在不同温度下热压变形后的微观结构进行表征。基于对动态再结晶过程关键参数-再结晶体积百分含量(volume fraction of DRX)、晶界取向差分布(misorientation angle distribution)和孪晶界含量(fraction of twin boundaries)的量化分析,实现对动态再结晶机制的辨别。充分发挥了EBSD大面积定量分析的优点,展示了其在量化分析金属材料动态再结晶机制中的优势。

Electron backscatter diffraction（EBSD） was applied to characterize the microstructures of Nimonic 80A deformed at elevated temperature.Based on quantitative analyses of key dynamic recrystallization（DRX） parameters,including volume fraction of DRX,misorientation angle distribution,and fraction of twin boundaries,DRX mechanisms occurring during the hot working were studied and successfully identified for different hot-working temperatures.With the advantage of fast indexing for large-area quantitative analyses,EBSD was demonstrated by this work to have a high potential in the study of DRX mechanisms in metals.