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在所研究的Fe3Al,Fe3Si,FeAl,Ni3Al,NiAl和TiAl等金属间化合物中均发现大晶粒超塑性。显微分析表明 ,超塑性变形过程中晶粒明显细化 ;电子背散射衍射 (EBSD)技术和透射电子显微学(TEM)分析表明 ,大晶粒金属间化合物超塑变形过程中形成了大量亚晶界网络 ,且随变形量增大 ,亚晶界不断吸收晶内滑动位错 ,使其位向差不断增大 ,从而逐渐演变成小角度和大角度晶界 ,即超塑性变形过程中产生了连续动态回复与再结晶 (CDRR)。高温塑性变形是通过位错的滑移和攀移进行的 ,而亚晶界的迁移、滑动和转动起到协调变形的作用 ,保持了材料在宏观上的超塑性
In the study of Fe3Al, Fe3Si, FeAl, Ni3Al, NiAl and TiAl and other intermetallic compounds were found in large grain superplasticity. The microscopic analysis shows that the grains are obviously refined in the process of superplastic deformation. The electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis show that a large number of large intermetallic compounds are formed during the superplastic deformation Subgrain boundary network, and with the increase of deformation, the subgrain boundaries continue to absorb intracrystalline slip dislocation, the bit-direction difference increases, and gradually evolved into small-angle and large-angle grain boundaries, the superplastic deformation process A continuous dynamic recovery and recrystallization (CDRR) was generated. High temperature plastic deformation is through the dislocation slip and climbing, while the subgrain boundary migration, sliding and rotation play a coordinating role in deformation, maintaining the material in the macroscopic superplasticity