Is the Crystalline Lattice Structure in Nanocrystalline Materials Different from the Perfect Crystal Lattice?

Ke LU National Key Laboratory for RSA,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaManling SUI Department of Materials Science and Engineering,Northeastern University,Shenyang 110006,China

摘 要：<正> A thermodynamic analysis of the ultrafine crystallites in nanocrystalline materials was presented inthis work.It was deduced that the structure of the nm-sized crystalline grains is different from theperfect crystal lattice,characterized by two possible structure changes;supersaturation of alloy ele-ments and crystal lattice distortion resulted from supersaturation of vacancies.Some experimental ev-idences in the literature,which are in agreement of the thermodynamic consideration,indicate thatthe structure changes in the nm-sized crystallite seems to be a consequential feature of thenanocrystalline materials.

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