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Abstract: A series map of selected area electron diffraction patterns(SADPs) of Γ1 phase in commercial galvannealed IF steel sheet were investigated by transmission electron microscopy(TEM). The cross-sectional TEM specimen was prepared using focused ion beam (FIB) technique which was also introduced briefly. The results show that there exist superlattice reflections in the SADPs of Γ1 phase which indicate that Γ1 phase is a kind of ordered intermetallic compound with twice times period. It is different from the six times period structure of Γ1 single phase specimen which was prepared by special method. [Copyright &y& Elsevier]

Abstract: In this paper, the possibility of surface nanocrystallization of Ni3Al intermetallic by surface mechanical attrition treatment was explored. The microstructure and hardness of treated sample were characterized through scanning electronic microscope, transmission electronic microscope, X-ray diffraction and nanoindentation examination. The results showed surface nanocrystallization was realized on Ni3Al intermetallic by surface mechanical attrition method. The nanocrystalline in top surface was about 10 nm and a deformed layer about 10–30 μm formed. Nanoindentation examination showed the nanohardness increased sharply to a maximum and then decreased in a narrow depth till to a stable level with the depth from treated surface. The maximum nanohardness of surface was near 12 GPa. [Copyright &y& Elsevier]