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Nanocrystalline alloys are usually referred to as single-or multi-phasepolycrystalline alloys with grain sizes in the range of 1-100 nm. These materials canbe thought of as two parts:nanocrystallites and interfaces. Gleiter et al.claimedthat the interfaces of a nanocrystalline material are gas-like, showing neither long-norshort-range order. Up to now, the interfacial structure of nanocrystalline materialshas been extensively investigated, and many properties of these materials are main-ly related to the interfacial structure as well as the volume percentage of interfaces.However, Thomas et al. failed to observe the gas-like interfacial structure as claimedby Gleiter et al. by using a high resolution electron microscope. Meanwhile, it was
Nanocrystalline alloys are usually referred to as single-or multi-phase polycrystalline alloys with grain sizes in the range of 1-100 nm. These materials canbe thought of as two parts: nanocrystallites and interfaces. Gleiter et al.claimedthat the interfaces of a nanocrystalline material are gas-like, showing neither long-norshort-range order. Up to now, the interfacial structure of nanocrystalline materialshas been extensively investigated, and many properties of these materials are main-ly related to the interfacial structure as well as the volume percentage of Interfaces. Yet, Thomas et al. failed to observe the gas-like interfacial structure as claimed by Gleiter et al. by using a high resolution electron microscope. Meanwhile, it was